Basic Scoring System Implemented

The game now scores you +100 for every waypoint you pass through, and +
60 on the minute every minute for staying alive (this bit is a bit
buggy)
Also displays score on the left-hand-side menu, under Nav/Plan modes.
Resets score to 0 upon game end.
Changed tests slightly so wouldn't crash - testers still need to update.
Other things changed as needed/removed (i.e. in Airspace)