Git Changelog Ready Player Fun Mod

Version 1.21.1-3.0.0.0

 - Release 1.21.1-3.0.0.0
 - Wait until level is loaded to pause.
 - Rework mod to be a backport of 1.21.2+ behavior.
 - Don't tick anything on server pause. Some mods are abusing the main thread and not just using world tick.

