Customizable Player Models

Backports:

• b1.7.3 port (StationAPI required)
• 1.2.5 port
• 1.4.7 port
• 1.5.2 port
• 1.6.4 port

Ported to 24w13a and 24w14potato
Added Iris 1.7 beta compatibility to 1.20.1 and 1.20.4 (Fixes the crash)
Added linear interpolation to value layer updates
Updated Simplified Chinese translation (#586)

Fixed first person hand flashing red on 1.7.10 (Closes #583)
Fixed crash with RenderPlayer API on 1.12.2 (Closes #566)
Fixed translucent textures showing solid on 1.7.10 and 1.8.9 (#401)
Fixed crash with Optifine 1.20.4 (Closes #585)
Fixed Copy Transform tooltip reports incorrect toggles (Closes #587)