add widget WaypointView to widget WaypointList when create a waypoint with mouse over the map

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

Continue the scaffoldinf for the WP click creation. Now the waypoints are graphically shown in the MapControl. Ready to start interacting with the Waypoint widget

Finished scaffolding the graphical addition of WP via the MapWidget. Added the possibility to display the latitude and longitude of the cursor as a property of QMapControl. Major reorganization of the MapWidget constructor

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

Improved runtime performance, currently hunting down a bug where the whole application gets repainted although only parts of it are refreshed