- Moved all MavManager functionality to Vehicle
- Updated all code to use Vehicle instead of MavManager
- Removed MavManager

- MultiVehicleManager is a Qml friendly replacement for UASManager
- Vehicle is a replacement for both UAS and AutoPilotPlugin

- FirmwarePlugin is the new place for code which is specific to
firmware flight stack
- FirmwarePlugin currently supports flight mode apis
- Modify code to use new FirmwarePlugin support

Also restructured some toolbar positioning QML to handle resizing.

Everything is now based off of default font pixel size

Also adding a constant for the font size in SensorComponent.

If Facts are referenced from FactPanelController, we need to reference
count the AutoPilotPlugin such that it doesn’t get destroyed until
after the FactPanelController is destroyed.

Sorting source and headers while at it.

Initial rendering of Waypoints

QGCUASParamManager and friends are replaced by FactSystem

I forgot an extra argument for debugging (and didn't have WarningsAsErrorsOn properly set)
No idea how that emit qDebug ended up in there.

Removed left over debug message.

- All resources are either under src or under resources dirs
- Removed files top level directory
- Move flightgear files to top level dir

Use default font wherever possible. Where that doesn’t work, use
ScreenTools::dpiAdjustPointSize.

Also many LinkManager API changes to further isolate all link
management inside LinkManager.