trench improvements, etc
tweaked onion slalom pattern
Merge branch 'master' of github.com:Facepunch/SpaceUsurperUnity
freeze works on units that are small enough
fix getNumTimesShot
removed some duplicated code rect/diamond hitbox checking
removed some more duplicated Stage_Bullets code
repel works on small units
frozen bullets can be repelled, tweaked tutorial powerups
some more freeze-timescale-impulse unit interactions
fuse stage achievement
Merge branch 'master' of github.com:Facepunch/SpaceUsurperUnity