Refactor of client mixin for PlayerSkinTexture, moving to a static class, and conditional mixins for different Minecraft versions.

Removing import net.minecraft.client.util.SkinTextures (fails on 1.20, 1.20.1), adding 2 mixins for different Minecraft version support.

New Custom Player Icon support (if black/white pixel set at 31, 49), uses certain empty UV coordinates in player skin file.

- Removing example mixins (from Fabric starter project)
- Replacing old screenshots
- Added Discord invite link to README

Inject Mixin to hide custom name from appearing on Entity. We will be drawing the custom name ourselves.

Initial proof of concept changes to Fabric Minecraft example mod. Generate 1 random ChatGPT prompt, display it above all Living Entities.

Now uses split-sourceset's