Add FOLLOW flight mode

Work around quirkiness with ArduPilot and LOITER_* NaN handling on heading.

Copter 3.7 CH#_OPT -> RC#_OPTION name change

ArduPilot for configurable mavlink stream rates

Support STATUSTEXT_LONG

Remove the concept of reserved buttons for manual control

Add gotoFlightMode method

Assume non autopilot components follow current mavlink param_value spec

ArduPilot option to not start mavlink streams

Don't starts streams from QGC side. Assume firmware side does the right thing.

Update Rover flight modes

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

FirmwarePlugin: Issue a warning upon connecting if the firmware in use is not using a stable release

Added support for qgcRebootRequired Fact meta data value.

Move ArduPilot preflight check handling to generic QGC

Includes support for battery 2 setup