Update to 1.21

[DrexHD]

Things to specifically look into:

• Kotlin has been bumped to 2.0.0 (could not identify any changes that need to be made)
• Identifier constructors have been private'd causing some problems with konf. Applied a workaround using a wrapper to provide a constructor for the library (couldn't figure out any better solution). Marked with // TODO 1.21
• Enchantments got reworked and frost walker is now implemented using ReplaceDiskEnchantmentEffect. It is now impossible to know if the blocks have been placed by frost walker or a custom datapack enchantment, also marked with // TODO 1.21

[BenCat07]

Any new Identifier(...) can simply be replaced with Identifier.of(...)

can just search and replace new Identifier( -> Identifier.of(
no need to use any kind of wrapper as far as i can tell.

Update: forgot this is Kotlin. Nevermind then

[Dezaku]

any updates on this?