authlib-injector support

Could be nice to have authlib-injector support built into this, since Yggdrasil is already an option.

For a reference on how to implement, this page can be consulted: https://docs.ely.by/en/authlib-injector.html#client

Essentially would involve:

• Downloading authlib-injector from the repo: https://github.com/yushijinhun/authlib-injector,
• Adding the downloaded .jar file as a javaagent in the Java command line,
• Adding the desired URL given in the portablemc command line to said javaagent argument.

[mindstorm38]

Really good idea for the Rust rewrite!

[rsg245]

Really good idea for the Rust rewrite!

Add to roadmap of 5.x.x major version!

[mindstorm38]

Good idea, 5.1.0 would be nice! I've always been interesting in this topic btw

[rsg245]

@mindstorm38, it is possible to add this using JVM arguments. Check ely.by docs