Splitting the "Creature hostility" level selections for wild animals vs. drifters/locusts

[Vivi_IX]

The current options for hostility (Aggressive/Passive/Never Hostile) work really well, but it would be nice to be able to have control over the levels of hostility for different mob types would be useful, so you could say set it to: 

Wild Animals: Passive
Drifters/Locusts: Aggressive

This would keep underground challenging and hostile, but make wandering the surface a bit more peaceful. This would let you set it however you want.