updated mission file

Detailed the map a bit more and fixed a few more bugs

fixed a stuck spot near the elevator climb ladder (hopefully) and added some survivor clip brushes in some spots

removed the smg in the entrance room and moved a crutch cause you could grab it thorugh the ceiling.

Added crutch melee weapons around the map

connected room nav with hallway on 3rd floor that for some reason wasn't attatched- should be last edit on nav

added a few survivor clip brushes. should be the last update for now.

updated nav at the elevator