[2020] New Enemy AI system

(original title): Enemies may now target and attack Structures and Animals

[notes from lazy] Let’s try to make our parEnemy class a bit more modular and well set up for the new kind of tasks we’re going to have to do in this update. Really just organizing the various common behaviors in a way that can be easily inserted into new / existing enemies. We also may need some better methods for pathfinding, as the current pathfinding isn’t great, and enemies will have to do more of it now to attack structures and animals. Maybe this should all be tied in with an FSM?

Really its down to your judgement here @nommiin_ – looking over what we need for this update and what exists, feel free to explore it and chat with me about what you’d like the changes to look like, then we can go from there