Fix display of param load errors

Revert QGuiApplication->QApplication change since it breaks message dialogs.

Check for pending param writes on app close

New centered PlanEditToolbar

Better incomplete data visuals

Rework Mission Complete dialog for correct Resume Mission on ArduPilkot

Hide pre-arm message when vehicle arms

Add missing flight modes

bug in ParameterEditor removed, double-ckicking on a group button shrank width of rectangle and thus of mouse area to 10

CameraManager: bug in CameraPageWudget.gml, stream variable not defined, also avoids a gray spurios window