Mini balance tweaks/nerfs for facehuggers.

Created by: gbasood

Rig helmets now have a much better RNG chance of protecting against facehuggers. Facehuggers ripping off helmets will no longer immediately jump on the face of the person whose helmet was just ripped off. Facehugger toys no longer die. Lamarr no longer dies on bashing into a helmet. Fixes #8279 (closed) Resolves #8214 (closed) partially enough that it should be closed