Major (and minor) bug fixing.

Looks like I finally squashed the bug that caused the game to stop spawning enemies and halting all progression!

I hope it doesn't come back. Someone tell me if it does okay?

Also:

• Fixed collision on Boomerang.
• Got the Boomerangs spinning liked you'd expect. 
• Fixed the target selection for homing projectiles.
• Fixed the weird delay on player customization UI screen.