Trivial: if ship is turning to meet mouse cursor and you open the map, you keep spinning

[Cervator]

Tiny tiny bug and a GFI candidate I expect.

• Be in mouse + keyboard mode
• Move the cursor somewhere it takes your ship a moment to spin toward and meet
• Open the map before your ship finishes turning
• Observe your ship spinning forever on the map screen, twirling and twirling its dance of doom!

To fix: Find where game mouse input causes ship rotation. Reset that process if the user opens the map screen :-)

Bonus: Try to find other similar cases. If you're actively accelerating and hit the map key at the same time do you keep accelerating?

Edit: As noted in #627 we should check to see if this can happen with acceleration getting "stuck" as well