CustomSkinLoader

Special thanks to @ZekerZhayard

• Support 1.21

Special thanks to @ZekerZhayard

• Fix #286 (#287)

Special thanks to @ZekerZhayard

• Fix #284 ( #285 )

Special thanks to @ZekerZhayard

• Support 1.20.3 & 1.20.4 (https://github.com/xfl03/MCCustomSkinLoader/pull/281)

• Fix method not found in 1.8-1.12.2

Special thanks to @ZekerZhayard

• Fix crash (https://github.com/xfl03/MCCustomSkinLoader/pull/273)