With 24 MHz accesses to the SD card were unreliable. And the chance of
failure recently got worse, so that logging became impossible.

 - needed for code coverage of python scripts

- platform is optional and matters for Visual Studio builds
- `ver` command shows the windows version
and was just my first CI test

    - mavlink v2.0 in PX4/Firmware (88f2a685): https://github.com/mavlink/c_library_v2/commit/171c83700c6318af9ffb4a7ee733567b55a14543
    - mavlink v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/c6ab0459343c78a6a424514b5f64fa65d8cc0cf8
    - Changes: https://github.com/mavlink/c_library_v2/compare/171c83700c6318af9ffb4a7ee733567b55a14543...c6ab0459343c78a6a424514b5f64fa65d8cc0cf8

This should fix the macOS build.

When using QGC and/or the Dronecode SDK it was possible to get in a
state where the two mavlink instances were both publishing their last
heartbeat_time and cause commander to consistently toggle between
data link lost and regained. With this fix, we only ever look at the
very last heartbeat time and therefore seem to avoid this issue.

This prevents a warning message being printed to SITL users because the
UAVCAN_ENABLE param does not exist.

With this change the param SDLOG_MODE can be used for SITL as well.

loiter mode since it's the failsafe mode

instance protected

updateAvoidanceSetpoints->updateAvoidanceDesiredSetpoints

to check progress

waypoints in FlightTasks. In obstacle avoidace library reset desired
avoidance waypoints after publication

https://lgtm.com/rules/10030086/

    - ecl in PX4/Firmware (3a004d13dc13d81403ae3873d5109c0503a4f964): https://github.com/PX4/ecl/commit/a892ececf8490b21aa8917bc243b2bc441af6a87
    - ecl current upstream: https://github.com/PX4/ecl/commit/f95cd4b3584d029c35b288a39180ddf25b2dd004
    - Changes: https://github.com/PX4/ecl/compare/a892ececf8490b21aa8917bc243b2bc441af6a87...f95cd4b3584d029c35b288a39180ddf25b2dd004

    f95cd4b 2019-01-22 Roman - ground effect: removed dependency on local position
7845ff4 2019-01-23 CarlOlsson - EKF: increase wind process noise scaler to 0.5
32ca6f7 2018-10-24 CarlOlsson - ekf: scale wind process noise with low pass filtered height rate
938c8ad 2019-02-04 CarlOlsson - EKF: use hagl estimate if valid for when to trigger yaw reset on takeoff
8b4ae48 2019-03-05 Hamish Willee - README: Fix link to EKF/ECL tuning guide
f0889c1 2019-03-18 Carl Olsson - EKF: fixed some comment typos
6e77b19 2019-03-14 Todd Stellanova - Add DataValidatorGroup tests, add more DataValidator tests (#592)

    - mavlink v2.0 in PX4/Firmware (1c8aeab34d70c2a3ebee4c94397c4aa62c955ec7): https://github.com/mavlink/c_library_v2/commit/b32bd3f004b971c03711617c79e5dc67e720e864
    - mavlink v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/171c83700c6318af9ffb4a7ee733567b55a14543
    - Changes: https://github.com/mavlink/c_library_v2/compare/b32bd3f004b971c03711617c79e5dc67e720e864...171c83700c6318af9ffb4a7ee733567b55a14543

    - sitl_gazebo in PX4/Firmware (d36c0e13): https://github.com/PX4/sitl_gazebo/commit/2f0070ec6c29c34b9bae10ac03224775627c338a
    - sitl_gazebo current upstream: https://github.com/PX4/sitl_gazebo/commit/e0dfe7ea45c849e676c201b7428bf8df975d4790
    - Changes: https://github.com/PX4/sitl_gazebo/compare/2f0070ec6c29c34b9bae10ac03224775627c338a...e0dfe7ea45c849e676c201b7428bf8df975d4790

    e0dfe7e 2019-03-11 Jannik Beyerstedt - Fix compiler error with openCV (C++11) on macOS