added functions to create global waypoinst, modifying the WaypointList class, MapWidget and MainWindows.

add the functionality to erase the list of Waypoint widget (WaypointView) from the button of the WaypointList widget

Changed NUM_OUTPUT_SIGNALS to an const unsigned short from a #define and moved its definition into OpalRT.h from OpalLink.h so that the configuration would all be in one place.

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

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

Significantly improved plotting, now capturing data in linechart allows limmediate processing / analysis of the whole flight