Resized the airspace 32 units down from the top. This made the mouse
event off by 32 units, which I "fixed" by adjusting the mouseY position
when you enter the demo screen. There's a new variable for this in input
which gets set to 32 when you enter the demo and 0 when you exit.
Readjusted the entry and exit points and their name labels.

Changed the colour of entry/exit points to yellow.

The compass still needs adjusting as does the disabling of manual flight
mode when you fly out of the airspace at the bottom.