Immersive Portals

Update to 1.20.4.

Note: this version is preview and is not yet stable. It's recommended to backup world before using.

This version contains a lot of internal refactoring:

• A new portal shape system that can handle 3D box portal shape.
• The mod structure has been refactored back into one mod. (It used to be split into q_misc_util, imm_ptl_core and outer mod.) It makes future development easier both for Fabric version and Forge version.
• A lot of other refactoring, including using Fabric API for datapack portal generation.
• Provides functionalities for future versions of MiniScaled mod.