Smart RTL 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

Adjust fly overlay height
Change minimum Qt version to 5.11+

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

Windows fixes

Fixed flight widget position.

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

Fix jscript complaint

Simpler control design for better mobile display

Updated MAVLink to handle video stream types (auto discovery)

Hide guided map indicators when vehicle goes away

Better show/hide behavior of guided map indicators

Map Indicator confirm/cancel support

Show Orbit center from telemetry

Fix rotation

Show orbit telemetry status on map

* Add support for showing rotation on QGCMapCircle.
* Support rotation change for Orbit

Clip video rectangle so when aspect ratio is adjusted, the image is not larger than the containing (window) rectagle.