- this flag often results in hiding useful information, or adding
   useless information to the mavlink console

 - only call prearm if preflight passes
 - prearm always provide feedback

 -  fixes #9155

Battery warning gets only fired if a battery is inserted.

The goal is to improve the readability for expressions like:
if (hrt_elapsed_time(&start_time) > 8000000)

Available since C++11

- ecl in PX4/Firmware (163fdded13d1cb48ea4849a4596feaa7025cb796): https://github.com/PX4/ecl/commit/ba2b9dfdd96d50d697165407b88b5bc94cdef84c
    - ecl current upstream: https://github.com/PX4/ecl/commit/02e319431b948f660f8548707849489d6c822fad
    - Changes: https://github.com/PX4/ecl/compare/ba2b9dfdd96d50d697165407b88b5bc94cdef84c...02e319431b948f660f8548707849489d6c822fad

02e3194 2018-04-11 Daniel Agar - cmake remove embedded vim settings
91b5bfe 2018-04-11 Daniel Agar - attitude_fw remove unused perf include
02055ac 2018-04-09 Paul Riseborough - EKF: Fix non GPS aiding data reset logic (#418)

    - DriverFramework in PX4/Firmware (1297859680ce15980a970c95d7caa95be67957c7): https://github.com/PX4/DriverFramework/commit/f98ea65e9bd35a8d2bdedd39e519b7320fe82b16
    - DriverFramework current upstream: https://github.com/PX4/DriverFramework/commit/e06222dd151e2f92476762e483915df5bd67929d
    - Changes: https://github.com/PX4/DriverFramework/compare/f98ea65e9bd35a8d2bdedd39e519b7320fe82b16...e06222dd151e2f92476762e483915df5bd67929d

    e06222d 2018-04-11 Daniel Agar - cmake change px4_add_module -> px4_add_library

- 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

    - sitl_gazebo in PX4/Firmware (4ffa98aa): https://github.com/PX4/sitl_gazebo/commit/28921bca9df9a212675b8e888c926d1ec6f6b28e
    - sitl_gazebo current upstream: https://github.com/PX4/sitl_gazebo/commit/0df46c53b14ef4241b33fb7a74a3cb6f9d83c6dd
    - Changes: https://github.com/PX4/sitl_gazebo/compare/28921bca9df9a212675b8e888c926d1ec6f6b28e...0df46c53b14ef4241b33fb7a74a3cb6f9d83c6dd

    0df46c5 2018-04-13 Tully Foote - Only use catkin env hook command if building with catkin.
38c0d07 2018-04-12 Tully Foote - Add package to GAZEBO_RESOURCE_PATH to make the worlds accessible.
5811488 2018-04-11 Tully Foote - updating OpticalFlow submodule
7c79bd7 2018-04-10 Tully Foote - Add environment hooks to export paths for plugins and resources.

We got over the limit

Signed-off-by: Roman <bapstroman@gmail.com>

- created one method which has access to the pwm output device

Signed-off-by: Roman <bapstroman@gmail.com>

- board config can define PX4_PWM_ALTERNATE_RANGES which needs to be known
by the compiler prior to processing this file

Signed-off-by: Roman <bapstroman@gmail.com>

Signed-off-by: Roman <bapstroman@gmail.com>

Signed-off-by: Roman <bapstroman@gmail.com>

Signed-off-by: Roman <bapstroman@gmail.com>

to VtolType class

Signed-off-by: Roman <bapstroman@gmail.com>

- moved methods used to modify channel maximum pwm value to VtolType
class so that the can be shared by the differnt vtol types

Signed-off-by: Roman <bapstroman@gmail.com>

 - closes #9277