AI Improvements!

CPU opponents now decide attacks and movement based on positioning! This is my first time programming something like this, but each character has its own preferred spacing distance and a set of moves to pick from when at the corresponding distances. There will most likely be more updates to AI in the future, but just having this is a massive improvement over the previous "hit random buttons". This will finally avoid things like them trying to use distance-closers up close and swinging at air from 10 feet away!

Doing a quick update after the last one because I realized I had the sound settings set incorrectly in the last update.