Fixed Shub-Niggurath crash upon sight. The game tries to call built-in think methods when a monster has an enemy that Shub wasn't designed with. Wrote a new isolated "sight" function specifically for Shub. Could be optimized more for sure if she's used in any custom maps, but will perform just fine for the final vanilla map.
Known Bug: using the "Kill" command in Rerelease multiplayer will crash the game. I think I might be able to fix this. For now, just don't use "Kill" in Rerelease MP.