[Unstable] Half-commit of unchanged files

ATC:
-code readability changes
-fix for display issue when plane completes a flight plan (ft. Jake)

Airspace:
-tracks number of aircraft in the airspace
-eventHandover() now passes Flights between airspaces

Airport:
-sets altitude of waypoints (exit) to 11000 feet (3350m)
-hands over Flights when they reach a transferWaypoint

Flight:
-hidden wayPointDistance; references use get/set