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

looking at height rates

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

 - remove radio_status type since there's no type support in mavlink

    - genmsg in PX4/Firmware (92b52c56af728741b4ac9f57e583350b0fcd7c3b): https://github.com/ros/genmsg/commit/a189fc78558e7276df59d2961cfe4f8b4de08a8b
    - genmsg current upstream: https://github.com/ros/genmsg/commit/42e364661025b8f3d51486dc513d9e29cbd308da
    - Changes: https://github.com/ros/genmsg/compare/a189fc78558e7276df59d2961cfe4f8b4de08a8b...42e364661025b8f3d51486dc513d9e29cbd308da

    42e3646 2018-08-27 Jochen Sprickerhof - Use CATKIN_GLOBAL_ETC_DESTINATION for etc (#79)

This flag does not seem to be used anywhere.

Failure Detector - use bitmask field instead of boolean in vehicle_status msg (failure_detector_status) and instead of struct in class

This data is only updated at 5Hz and only required pre-flight.