Made QGCCorePlugin derive from QGCToolBox and expose everything through the same mechanism as everything else.

Moving source files into Vehicles as it is a more coherent place.

Forcing QGC to use Mavlink V2 if vehicle supports it.

This makes it available on mobile builds

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

Includes ability to load params

Move battery.percentRemainingAnnounce to Qml Global

The static Fact was causes problems with Qml

offline mission planning settings

more conversion stuff

some fixes and added area unit drop down

Conflicts:
	src/MissionEditor/MissionItemStatus.qml

removed comment

finish unit conversion

correcting typos

- Offline maps new set defaults to default map type
- Plan/Fly views use MapScale control