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

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