Improve Mixin compatibility and refactor to conform to Fabric conventions

[Bawnorton]

• Replace Overwrites and Redirects with less intrusive injections
• Rename Mixin classes from MixinClassName to ClassNameMixin
• Add Compatibility with default trim NBT data if the mod has been added after armour has been trimmed
• Capitalise ModInitializer class
• Reduce nesting

[Bawnorton]

That would be appreciated thanks :) Here's my curseforge account: https://www.curseforge.com/members/bawnorton/projects and my modrinth account: https://modrinth.com/user/Benjamin-Norton