Clean up references to MainRootWindow globals

Unified photo/video control which works with mavlink cameras and just video stream

Rework Fly View into separate layers which can be customized at each layer.

More FlyView encasulation. Make QGCPipOverlay completely self contained

Mavlink terrain protocol support

- Rename QGCInstrumentWidgetAlternate to QGCInstrumentWidget as it's now the default version
- Select  QGCInstrumentWidget as instrumentLoader source

Get rid of QGCView, QGCViewPanel and FactPanel. All messages and dialogs are now handled in the root window.

Android done.

Map control use different border color based on map type

I've also changed it so it reacts to hover events (changing the opacity in the process).

Plumb through initial object mode on Vehicle