Partway through refactoring of UAS deletion. This is in order to actually support removing UASes from QGC, which is currently impossible.

Removed OpenGL dependency in HUD, merged in HUD from Soren Kuula and config changes from Michael Carpenter

Impl. Lorenz suggestions wrt one velocityChanged, altitudeChanged, speedChanged signal per reference frame. Impl. CDI on compass disk.

Changes go UASQuickView handles resizing better, and doesn't "clip" text when the window is too small.

Reworked the UAS listing. It's organized differently and styled differently. Also the fading of the heartbeat status now works properly. Also fixed some theming issues with the connectButton when it was checked.

Hotfix: Fixed widget / UAS initialization order which led to text messages (and other updates) being ignored if the widget was not open when the UAS was created

Removed commented-out references to setStyleSheet(). Moving towards all styles being set in .css files

Fix for crash when removing item from QuickView, and addition of more generic signal/slot combonation for property updates

Added satelliteCount to the QuickView, and made quickview a default display on the mission planner view.

Changes for the new "View" navigation, and fixes to get most of the dockwidgets working with the new view system

Removed a lot of verbose debug output, added connection indication to main menu bar to improve situational awareness of operator