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.

Significantly bugfixed persistence and link adding/removal. Not yet fully there, but getting closer to release

Ardupilot support, builds now cleanly on Windows. Fixed a bug where the application could crash if no system was connected.

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

Cleaned up and commented major code parts. Refactoring HDD and HSI widgets to support QGraphicsView drag-and-drop, tested multi-MAV support more intensely, currently adding the system coloring to all widgets

Major cleanup of MainWindow constructor. All widgets have now the visible property set to false on its constructor

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

Pushed parameter interface forward, now receiving of onboard params works, working on display and writing