[scarf] Goblins Don't Deserve Geneva Conventions

want to play with cannibal: horrible but don't want to care bout goblins?
worry no more!
adds precept 'goblin exceptionalism' that lets your pawn butcher goblins alive and feel nothing, or even better, good about it (if you're using war crime expanded 2).
also adds filter for goblins for only butchering goblins (and not human)

currently compatible with:
- https://steamcommunity.com/workshop/filedetails/?id=3032870787
- https://steamcommunity.com/sharedfiles/filedetails/?id=3523828989

it's obviously vibe coded so use at your own risk (works on my machine™)
source code: https://github.com/scarf005/rimworld-GDGC