And fix broken file path to save video on windows

- Shot Interval in Survey
- Much change to time/distance calc

Shows horizontal/vertical scroll indicators

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