Explain the feature

Some people might want to play on previous versions of Minecraft.

Ideal solution or implementation

Backporting to at least 1.18 would probably be for the best.

[Optional] Alternative solutions or implementations

No response

[Optional] Other context

• 1.18
• 1.17 (?)
• 1.16 (?, Not worth doing anything before this)

I finished the 1.16 back port but it's pretty scuffed so I won't be releasing it on any mod sites. There's no mod menu integration and you have to restart the game to apply authtoken changes.