Fix HammerCore URL stalling loading

[WaitingIdly]

changes in this PR:

• add the ability to skip the hammercore url check, as it can cause the program to stall depending on if the url is accessible - which it is not in russia (default: false).
• rename mixins.hammerlib.json to mixins.hammerlib.color.json.

inspired by https://github.com/friendlyhj/IsolatedCrystal3/blob/471f4b8bb163b7fa066d7d6c253f274c51730898/.minecraft/scripts/mixin/hammercore.zs

[what-the-diff]

PR Summary

• Improvements to README.md:
  • It now contains a new entry on a feature that allows us to skip an API check that might cause unnecessary delays.
• Addition to UTConfigMods.java:
  • This piece of code has been updated with a new option that can either enable or disable the skipping of this API check. Please note that any changes here will require restarting Minecraft.
• Changes in UTMixinLoader.java:
  • The path for a specific function has been changed. This has been carried out in order to ensure compatibility with improved URL management.
• Creation of UTModSourceAdapterMixin.java:
  • A new bit of code has been added that modifies a certain field to prevent any delays when loading certain URLs.
• File Renamed:
  • The mixins.hammerlib.json was renamed to mixins.hammerlib.color.json to reflect that it now focuses on handling color rendering.
• New file (mixins.hammerlib.url.json) added:
  • This new file will help in better URL management by allowing you to skip checks that could potentially slow things down.