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

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.

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

Added angle conversion testing, added battery settings option, added option to set MAVLink ID of groundstation

Added right-click option to select MAV, ensured that waypoints get updated properly on switching MAV

Substantially bugfixed and improved deactivation/activation and persistence of widgets. A lot of testing of Google Earth view, only minor improvements

Fixed initial startup bugs, cleaned up the activation-deactivation of update timers. Added initial instructions for new users.

Working on QGraphicsView-based local waypoints interface supporting drag-and-drop, commented code, fixed Google Maps interface, added mouse and SpinBox zoom to HSIWidget, fixed MAV-based coloring and stylesheets - MEGA COMMIT

Improved speed by preventing update of UASView on every vehicle state change, view is now bound to 10 Hz update timer