Testing framework & Naturalist mod

See merge request !8

- new junit test module
- 4 initial tests for attack, follow, and flee
- improved regex to support <behavior> or *behavior*
- improved message cleaning
- refactor of HTTP requests to remove some Minecraft and Fabric specific imports

- Large prompt refactor for system chat message

Alex's Mobs Art

See merge request !7

- Shader support (i.e. Iris, etc...)
- Updating CHANGELOG