Small December Patch

A small patch to address some recently reported issues.
-Fix autotargeting issue on vertical levels (again)
-Fix Bob Oboc and other followers not targeting asteroids when they have plasma
-Fix issue with some enemies spawning off screen and breaking killstreaks (if you find more please let me know)
-Fix a broken Wave Survival wave type (it would just sit there for ~60 seconds before progressing to the next wave)