[Request] Generic authlib-injector account system

[ghost]

Role

I play Minecraft

Suggestion

Add a feature.

Benefit

It will make per-server authentication easier.

This suggestion is unique

• I have searched the issue tracker and did not find an issue describing my suggestion, especially not one that has been rejected.

You may use the editor below to elaborate further

Different servers have online-mode set to true for different skin servers. For example, one server might have you sign up on LittleSkin and another on Blessing Skin in order to login through it with authlib-injector. On HMCL you can add these authenticators manually by setting the server instead.

Right now, UltimMC only has Local (so none), ElyBy, or Mojang, but not option to add servers manually.