fixing more incompatibilities

Airport:
-deprecated paramterless draw(), with warning in console
-added draw() with time, used to calculate colours
+removed redundant (time_waiting > 0) check; you can't get div/0 errors
without dividing...
-removed unecessary imports

AirportControlBox:
-modified drawLabels() to take current_time as a parameter to calculate
bar progress
-modifed draw() to take current_time as a parameter
-removed unecessary imports

GameWindow:
-updated to pass correct parameters to draw() of Airport,
AirportControlBox