skin overrides

sorry for the delay with this update! i've been a bit busy, but i'm hoping to get a full release for 2.4.0 out some time soon(ish?). in the meantime, here's another beta. enjoy the copper age!

• added support for The Copper Age (1.21.9)
  • skin overrides will also work on mannequins now
  • currently, overrides work for both static and dynamic profiles. this may become a config option in the future
• the library screen will now show previews with the player you're modifying
  • previously, this would have always been your own skin
• skins are no longer processed (gh#36). this means, for example, if you had a 64x32 skin, it would stay as that original 64x32 image, rather than automatically resizing to 64x64.
  • adding skins from a user no longer processes the saved image
  • setting your skin globally no longer processes it
  • this should improve compatibility with mods that do cursed stuff with skins (like ears)
• your online skin will now show to yourself on offline mode servers
  • this also allows you to see any overrides you have (gh#34)
  • this will be more configurable eventually
• duplicate library entries will no longer be loaded, and instead a warning will be printed to the log
• marked mod as compatible with pre-patch versions (e.g. the 1.21.8 version is marked compatible with 1.21.6 and 1.21.7)
  • this is mainly just so i can get 1.20.x and 1.21.x on the sidebar. i don't recommend using these old versions!
• some bug fixes
  • fixed library entries using textures (not files) not sharing or being changed globally
  • fixed the scroll bar on the override screen not usable (gh#42)
  • fixed identical library entries with different names being merged together
  • fixed a crash that could happen when reloading the library screen under certain circumstances (gh#40)
  • fixed capes added by name to the library using the skin texture instead on 1.19.4 - 1.20.2
• the code for the mod is now on codeberg rather than github. you can open issues at either place, though!