Predator mutations

Little something for the Carnivores and Beast types post-threshold.
I'll be branching off of this for the feeding behavior at some point,
but for the moment, here's the mindset.
Sapiovore

Hazard of going posthuman carnivorous: people become just another prey
animal.  All the food of cannibalism, none of the morale effects.
Merge pull request #5529 from KA101/Hunting-season

Predator mutations