Caxton

Initial port to 25w42a.

Update to Minecraft 1.21.10

• Caxton no longer crashes at startup when ImmediatelyFast is also loaded
• Fix some glyphs appearing at the wrong position

This update migrates the native support library to use HarfRust and Skrifa. This might introduce bugs; feel free to report them!

Update to 1.21.9-rc1

Update to 25w35a