- mavlink v2.0 in PX4/Firmware (613a5f5e172de071ebd96b4cb5313316a10f8023): https://github.com/mavlink/c_library_v2/commit/175ab6725cc0d96827d04ffeeaf3a7797a9abdbf
    - mavlink v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/90d9b285e01fe8bfa3b4e8868ca71c5537d43302
    - Changes: https://github.com/mavlink/c_library_v2/compare/175ab6725cc0d96827d04ffeeaf3a7797a9abdbf...90d9b285e01fe8bfa3b4e8868ca71c5537d43302

    - v2.0 in PX4/Firmware (3256e67fdc5e86b5d8c6378ea24ff8a065b65ba8): https://github.com/mavlink/c_library_v2/commit/c38176a0a63556815ea117c6877ce2dd18739231
    - v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/175ab6725cc0d96827d04ffeeaf3a7797a9abdbf
    - Changes: https://github.com/mavlink/c_library_v2/compare/c38176a0a63556815ea117c6877ce2dd18739231...175ab6725cc0d96827d04ffeeaf3a7797a9abdbf

    175ab67 2018-12-17 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/eaa914c7d9789bc37c9a6a59a5bd1171634bd429
4d5fa0d 2018-12-14 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/48df7ea08abb5d87df6ccb1f9a69b91ff3b89c7a
b65cfcd 2018-12-14 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/b671d3c24d5fc6aa964cd07a4a46566d4dbd7862
8473fe2 2018-12-13 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/2b9d470011a0d62fbfc3183ee172201e5170f7af
5a186d4 2018-12-13 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/68ed09da2e341b2932d9c9d761d7baa811191dc2

    - v2.0 in PX4/Firmware (2923e40d8777ccf2581d888f8e41a48dfa93f09d): https://github.com/mavlink/c_library_v2/commit/7c47254ddc8bf70eb5e82b4c2142a3faa4fa5780
    - v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/c38176a0a63556815ea117c6877ce2dd18739231
    - Changes: https://github.com/mavlink/c_library_v2/compare/7c47254ddc8bf70eb5e82b4c2142a3faa4fa5780...c38176a0a63556815ea117c6877ce2dd18739231

    c38176a 2018-11-30 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/4c160eac64675b87f7000a9a352654182ebcfba6
057bcc4 2018-11-30 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/113731eaaf53c6cd725eb973c7cc923aa43e9c23
b1aa2b8 2018-11-29 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/8349b1cf68565c249cbad8aae0db0a466478b6a5
c3ba3f9 2018-11-29 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/5e539462241d8a088619e842c72e8030c134ab0c
077265a 2018-11-28 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/62fa8289790696a59569a79461c88f8ecb45c5ac

    - Mavlink v2.0 in PX4/Firmware (d1dc8e440912e7918465163195b73531138e1e8c): https://github.com/mavlink/c_library_v2/commit/6203e2b64395cfa416b9321f633bc3256a79f722
    - Mavlink v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/7c47254ddc8bf70eb5e82b4c2142a3faa4fa5780
    - Changes: https://github.com/mavlink/c_library_v2/compare/6203e2b64395cfa416b9321f633bc3256a79f722...7c47254ddc8bf70eb5e82b4c2142a3faa4fa5780

    7c47254 2018-11-21 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/aa72b9e9806854ee822eb2fb4c70c26216113141

    - mavlink v2.0 in PX4/Firmware (14b8108caabb99d1bad2daef31ac51fc061b3691): https://github.com/mavlink/c_library_v2/commit/408a7bedf3074bcae265ea0ce8ec5bb3519ed272
    - mavlink v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/6203e2b64395cfa416b9321f633bc3256a79f722
    - Changes: https://github.com/mavlink/c_library_v2/compare/408a7bedf3074bcae265ea0ce8ec5bb3519ed272...6203e2b64395cfa416b9321f633bc3256a79f722

- mavlink v2.0 in PX4/Firmware (0b3f4014bf751cde2a08abb578c10ae5606404b1): https://github.com/mavlink/c_library_v2/commit/32dcf73bb24516dc0d52119e624fda8987a03f62
 - mavlink v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/408a7bedf3074bcae265ea0ce8ec5bb3519ed272
    - Changes: https://github.com/mavlink/c_library_v2/compare/32dcf73bb24516dc0d52119e624fda8987a03f62...408a7bedf3074bcae265ea0ce8ec5bb3519ed272

408a7be 2018-11-13 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/f3e60ba1ca9c458364cc9538499a1335aa2feb5e
c18232f 2018-11-12 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/2c52b06e125f88f6b674db112f127dc35d7a9c71
49a94c7 2018-11-09 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/c788ca3e143fbb0fd1f90a14fd2a473673b50973
0c4b296 2018-10-29 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/387c0fd71547d71f1e89578c8ef78c6bac8d6094
40bfa6c 2018-10-29 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/4590822ebde2a5737504c832669d74310afa4b8e
ad2c30b 2018-10-26 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/38ecb35a3e3e6702b5522ac33188a53cc1fe698e
9fbf059 2018-10-24 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/30b63eb0c20160ddeeca3eef4238f370d3f3d43f
7915ad4 2018-10-23 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/2c6a8807b85317275c9d027afba7f646eb7db961
4371e84 2018-10-23 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/573e35231804ad775796472bcdcd331b4479cf4d
d67e172 2018-10-22 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/40f83b2d4ff43fa65d08bb5ebeb9186dc2e8c2a6
852935c 2018-10-16 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/d683ddc28b1254ea8645dd2a18e5765b6bab0eba

- v2.0 in PX4/Firmware (6c822c67281ed3d36248dfe780107551b1a4eba7): https://github.com/mavlink/c_library_v2/commit/c5b465f5b455c5e6116cc5b6bf1332747a7b7494
    - v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/32dcf73bb24516dc0d52119e624fda8987a03f62
    - Changes: https://github.com/mavlink/c_library_v2/compare/c5b465f5b455c5e6116cc5b6bf1332747a7b7494...32dcf73bb24516dc0d52119e624fda8987a03f62

    32dcf73 2018-10-16 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/0ae270afc0fe9aa7595afddd2ea30c754650feb8

    - v2.0 in PX4/Firmware (f7a1da2261c579ef680c7d3b7a016bc4c6d13601): https://github.com/mavlink/c_library_v2/commit/e5f6257dd005b6fb3bff23d45f2b3b417b52539b
    - v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/c5b465f5b455c5e6116cc5b6bf1332747a7b7494
    - Changes: https://github.com/mavlink/c_library_v2/compare/e5f6257dd005b6fb3bff23d45f2b3b417b52539b...c5b465f5b455c5e6116cc5b6bf1332747a7b7494

    c5b465f 2018-10-01 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/bae3015ecc05299968362a4623d506ea2840ec86

    - v2.0 in PX4/Firmware (21f6ca4a): https://github.com/mavlink/c_library_v2/commit/fe2349dea9a88fb5b873eff2a59a88125943fd61
    - v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/d8fcf0a694dc11b3f83b89a0970e3d8c4e48d418
    - Changes: https://github.com/mavlink/c_library_v2/compare/fe2349dea9a88fb5b873eff2a59a88125943fd61...d8fcf0a694dc11b3f83b89a0970e3d8c4e48d418

d8fcf0a 2018-08-30 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/580a9ce77f3653d04937c9703dbd7fb31bf0ef33
189a1d8 2018-08-27 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/1a55f0bf6101d87ee50a92869c6a31a855526fd2

- v2.0 in PX4/Firmware (485c5db2): https://github.com/mavlink/c_library_v2/commit/6404047979cadac62fecd75070cd995f1ca66ca2
    - v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/fe2349dea9a88fb5b873eff2a59a88125943fd61
    - Changes: https://github.com/mavlink/c_library_v2/compare/6404047979cadac62fecd75070cd995f1ca66ca2...fe2349dea9a88fb5b873eff2a59a88125943fd61

    fe2349d 2018-08-11 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/141637e21e87a9c4ade90dbb9d544375294c106a
1d49e43 2018-08-09 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/f4fda461caaa0cb2c5dfed20d21a9d2a254b6c03

- v2.0 in PX4/Firmware (ca3e4a53): https://github.com/mavlink/c_library_v2/commit/2c4b0e9ff26ce4900a72335912e2604a1e9948de
    - v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/6404047979cadac62fecd75070cd995f1ca66ca2
    - Changes: https://github.com/mavlink/c_library_v2/compare/2c4b0e9ff26ce4900a72335912e2604a1e9948de...6404047979cadac62fecd75070cd995f1ca66ca2

6404047 2018-08-03 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/b4871443354d607298b6f67bedd6c473c69c659a
d0fb5b8 2018-08-03 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/1ba233efffb54a7ed634160cd11855b3f5021b74

- v2.0 in PX4/Firmware (5cac32de): https://github.com/mavlink/c_library_v2/commit/7014d02d665d5e8fa33f084f7c5f4dbcfd61b4b0
    - v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/2c4b0e9ff26ce4900a72335912e2604a1e9948de
    - Changes: https://github.com/mavlink/c_library_v2/compare/7014d02d665d5e8fa33f084f7c5f4dbcfd61b4b0...2c4b0e9ff26ce4900a72335912e2604a1e9948de

    2c4b0e9 2018-08-02 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/a31cd350d4c2046f2378fe64bb7b3da1cfa829f4
63f79b0 2018-08-02 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/8879d8e2f1ca51dbc0f4e57da0075076b1ade973
193557c 2018-08-01 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/e77128069d785b47dcc13033d555896ce28acf4c

- v2.0 in PX4/Firmware (6d662c55): https://github.com/mavlink/c_library_v2/commit/fb2c4f819819e2348285bc9e03ab711ceb6c4cc1
    - v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/7014d02d665d5e8fa33f084f7c5f4dbcfd61b4b0
    - Changes: https://github.com/mavlink/c_library_v2/compare/fb2c4f819819e2348285bc9e03ab711ceb6c4cc1...7014d02d665d5e8fa33f084f7c5f4dbcfd61b4b0

- v2.0 in PX4/Firmware (8feac973): https://github.com/mavlink/c_library_v2/commit/f2ae3ada7990d6fea25c5206057375e0c4d05672
    - v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/fb2c4f819819e2348285bc9e03ab711ceb6c4cc1
    - Changes: https://github.com/mavlink/c_library_v2/compare/f2ae3ada7990d6fea25c5206057375e0c4d05672...fb2c4f819819e2348285bc9e03ab711ceb6c4cc1

fb2c4f8 2018-07-19 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/de22395191208df6c42e243a6d7993e6a364e48a
550c3f5 2018-07-19 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/fe88d5fd12f94066a42b80ed44f7284c9b9e72a3
404f50f 2018-07-18 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/3940532218b0a1a9491d3f0fa5eec8d4555693ad

- mavlink v2.0 in PX4/Firmware (16d67ed1): https://github.com/mavlink/c_library_v2/commit/f5c0ba684659fbc6c6c5f8777bd30e0b3c32fdef
    - mavlink v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/e550f4124bc331848aad3d691b27ec941a94c1e5
    - Changes: https://github.com/mavlink/c_library_v2/compare/f5c0ba684659fbc6c6c5f8777bd30e0b3c32fdef...e550f4124bc331848aad3d691b27ec941a94c1e5

    e550f41 2018-06-29 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/9e9398d5d1d8d1eab689086b73b1258b595969bb
4fae56b 2018-06-27 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/174fc3aad7ce26be66979051261bfd1e5e2dde1e

    - v2.0 in PX4/Firmware (5e76f2dca7530404173601b4a231778381d4f3cc): https://github.com/mavlink/c_library_v2/commit/033fa8e7a4a75a0c3f17cea57e3be8966e05f770
    - v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/f5c0ba684659fbc6c6c5f8777bd30e0b3c32fdef
    - Changes: https://github.com/mavlink/c_library_v2/compare/033fa8e7a4a75a0c3f17cea57e3be8966e05f770...f5c0ba684659fbc6c6c5f8777bd30e0b3c32fdef

    f5c0ba6 2018-06-19 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/40f8149d642892b87c61acf3fb63d2512d06a22a

    - v2.0 in PX4/Firmware (a19fecad): https://github.com/mavlink/c_library_v2/commit/653ac745a57794a38c831f1ff296066a2e09c09b
    - v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/033fa8e7a4a75a0c3f17cea57e3be8966e05f770
    - Changes: https://github.com/mavlink/c_library_v2/compare/653ac745a57794a38c831f1ff296066a2e09c09b...033fa8e7a4a75a0c3f17cea57e3be8966e05f770

    033fa8e 2018-05-24 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/d8ea87b9c6173ad72a032219588e302eb8cb212a

This fixes the compiler warning with GCC 8.

This updates the MAVLink submodule to the current version including the trajectory WIP messages.

- v2.0 in PX4/Firmware (23017d051b7ff6686c8c8ff025a8e98af094780a): https://github.com/mavlink/c_library_v2/commit/163d4c84b9eb58a02cab94d039f54c303977d991
    - v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/c55dd0ec312a667f28b0cab4f1fe697d2888c00c
    - Changes: https://github.com/mavlink/c_library_v2/compare/163d4c84b9eb58a02cab94d039f54c303977d991...c55dd0ec312a667f28b0cab4f1fe697d2888c00c

    c55dd0e 2018-04-12 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/292874beed6bf756be45421bd2ae2420de921f2b
e2916e5 2018-04-10 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/012765b923546224ef928caeb86c72d5a78a433a

- v2.0 in PX4/Firmware (3ec37aa1): https://github.com/mavlink/c_library_v2/commit/95d4cb3b21130d67b251f323482f1c3fe1ce0c6c
    - v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/163d4c84b9eb58a02cab94d039f54c303977d991
    - Changes: https://github.com/mavlink/c_library_v2/compare/95d4cb3b21130d67b251f323482f1c3fe1ce0c6c...163d4c84b9eb58a02cab94d039f54c303977d991

    163d4c8 2018-04-08 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/07c4fc5f617383707317128e87ec9a0489ed3634

Latest: https://github.com/mavlink/c_library_v2/commit/95d4cb3b21130d67b251f323482f1c3fe1ce0c6c

Changes from v2.0 (https://github.com/mavlink/c_library_v2/commit/37d14af47d783eb516959cc10e4cf70d66e927c0) in current PX4/master (9fc1755c)
https://github.com/mavlink/c_library_v2/compare/37d14af47d783eb516959cc10e4cf70d66e927c0...95d4cb3b21130d67b251f323482f1c3fe1ce0c6c

95d4cb3 2018-03-28 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/f29e3302fef08a9df6bd2b2e944f1fbf35637035
f8b4fc9 2018-03-27 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/4accd6c062f6ca79a025f596744fc9cf907acc98
695883f 2018-03-27 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/b4efea1609631683c7b29f85571ba2f34a10116e
1bb9b2c 2018-03-27 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/56e28570a7557e62e95613d7bd13a96e8cf5e02e
68f9957 2018-03-27 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/8cf87fc5afe996604cc4399f21f83c7989ae5d9a
62abc60 2018-03-26 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/17207917a38ad690b3995e168b51bf232094b165
1b0dc47 2018-03-23 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/1d007c59dbe0121b7f2063a8919a44703634a5ef
925ab39 2018-03-21 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/5515533e8e5222aa1794616b124eddcaa040a5b3
f38624f 2018-03-15 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/91a22feb27e718373dd68e6fc57329f13f5e8d8a

This brings in new ROI commands and general sync.

 - update mavlink, cmake_hexagon, uavcan_board_ident to latest