MLRS UI overhaul:
- Initial work on actually making the new map work correctly. Position the target and true aim circles correctly. Allow placing the target with mouse (or with WASD).
- Fixed close button no longer working.
Used the trick that SAM rockets use, on the MLRS rockets: Put them on a Debris layer, so that they'll never detect each other as hits. I wondered why the SAM rockets did this One Weird Trick until I hit the same issue.