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

Major refactoring of the waypoint code. The new design fits the model-view-controller pattern better.

UASWaypointManager now implements the protocol described in http://qgroundcontrol.org/waypoint_protocol