Add support for chunked STATUSTEXT

Mavlink terrain protocol support

Plugin'ized follow me support

Handle ArduPilot strangeness with respect to components and mavlink spec for parameter messages

Smart RTL support

Support STATUSTEXT_LONG

Remove the concept of reserved buttons for manual control

Add gotoFlightMode method

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

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

Move ArduPilot preflight check handling to generic QGC

Use component id from heartbeat

Also added new FirmwarePlugin::brandImage support

_finalize methods need information which is not available if all you
have is a mavlink_message_t

- GeoFence support comes from plugin
- Circle fence support
- Better param support