Multi Version Bridge API

[Floweynt]

Provide an internal API over Minecraft to remove duplicated code across minecraft versions.

This is implemented via a set of interfaces, which are injected via loom interface injection (at compile time) and Mixins (at runtime). A stub class will be exposed to common as API, which provides static methods. These methods are overwritten via Mixin at runtime.

Goals:

• Abstract most version independent logic to common
• Reduce maintenance burden for new & old features

Non-goals:

• Provide a stable external interface to third-party modules
• Implement "multi-version" jars
• Have "perfect" abstraction - some leaky abstraction is allowed, but these must be for specific edgecases only, e.g. an OpenGL call that's only needed in 1.8.9

Checklist:

• [x] Implement Bridge API for 1.8.9 (reference implementation for ports)
• [x] Implement Bridge API for 1.16
• [x] Implement Bridge API for 1.20
• [x] Implement Bridge API for 1.21
• [x] Implement Bridge API for 1.21.4
• [x] Port most HUD modules
• [ ] ~Port other modules~

During the porting process, 0 or some other suffix may be appended to avoid name collisions. These will be removed once colliding packages & classes have been abstracted away.

[Floweynt]

Resolved some of the comments. The code currently is ugly and has extraneous diffs, but I will clean them up later with some automated tooling. I just want to get everything in a working state before I deal with that.

[Floweynt]

Limiting the scope of this now. Only porting Hypixel and HUD modules, and not even all HUD modules. I want this to be in an usable state in a few months, and begin testing soon.

Future work can include porting other modules / cleanup.