* Adds limb destroyer behavior to hostile mobs. Mobs with this behavior will (usually [thanks proc/ran_zone]) attack the weakest limb of a mob until it gets dismembered
Adds ishostile() for this pretty specific situation
Behavior added to viscerators
* Generalizes the ability to dismember with an unarmed strike to living
* Gives xenos limb_destroyer at WJohn consultation
If a monkey or a human is var edited to have destroyer, that works now
fixes a potential runtime