Smart RTL support

Add support for ESC Calibration

Add support for geofence return point. Also fixed a bunch of bugs in geofence and rally point support.

Handle connection to non initialized target

Use a root based global variable (mainWindow.flightDisplayMap) instead of relying on child scoped names (_flightMap)

Better handle the dirty state of Airmap's flightplan

More work on no serial port ifdef

Fix no serial and android builds

Check for CubeBlack service bulletin

Fix incorrect isManualCamera logic

Fix initialization

Pattern Preset support

Adjust fly overlay height
Change minimum Qt version to 5.11+

Restore QGC to its normal UI layout (buttons on toolbar)

Use consistent Altitude Mode labeling