ADSB server support provided through new ADSBVehicleManager implemenation

Support for new TakeoffMissionItem and Takeoff Tool 

Integrate Create Plan overlay in File DropPanel

New Create Plan support

Corridor edit toolbar

New control

Save/load main window state

Rework presets

Use TabBar in Complex Item UI

New QGCOptionsComboBox control

Allow split of current segment

FW Landing slope heights display

New QGCDynamicObjectManager support

New MapLineArrow control

New base class control for Survey/Corridor

Add gimbal to external control signal

Move PreflightCheckList to custom builds only. The model, which used to be implemented within BuiltinPreFlightCheckModel is now within the control itself. It is up to the implementer to define a proper model.

New qml base log replay status bar

Switch to using firmware manifest for ArduPilot flashing

Update ArduPilot version to latest releases only

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

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

Offline Maps: Allow custom build settings overrides

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