rrrrrooocket!

I just finished the next revision of the Rocket AI and it's pretty decent. I can opt for the missiles to be aware of their minimum turning rate or not and they're pretty good at tracking any stationary target not near the ground.

I also added the white trail smoke which looks pretty hot. It's currently using a shiiteload of particles which I need to trim down, and they are generated from the center of the projectile, not at the tail, which looks a little off.