LinkInterface and Vehicle uses mutexes to synchronize writing bytes to the link instead of queued signals

Also fixed custom build

Set RC To Param support

Remove unused HIL code

Remove unused code

Map gimbal controls
Keep track of gimbal position within Vehicle

Add gimbal to external control signal

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Move ArduPilot preflight check handling to generic QGC

Some crazy shit in UAS.cc was using an array of 256 bytes to handle received messages and mapping them to components. Well, any message ID over 255 would cause a buffer overrun.

* Some code moved to Vehicle

This reverts commit ae976049ca7b4818616e6b8be07a028fc7dfc26f.

Removed incorrect Vehicle.altitudeWGS84