min/max velocity/altitude moved to Flight

FlightPlan:
-partial refactoring, auto-indenting
-converted to use flight's min/max velocity/altitude, or else flagged
with {!}
-converted to use Game's max width/height constants

Controls:
-removed MINIMUMALTITUDE, MAXIMUMALTITUDE
-converted to use flight's min/max velocity/altitude
-fixed loading wrong image for altitudeButton

Flight:
-stores its own read-only min/max velocity/altitude
-converted to use min/max velocity/altitude, or else flagged with {!}
-partially converted to use Game's max width/height constants

FlightMenu:
-converted to use flight's min/max velocity/altitude