Port to Minecraft 1.21

[raoulvdberge]

Do this as soon as a new clear API comes up.
Candidates so far:

• Adorned (Curios)
• Curios API Continuation

[raoulvdberge]

The official Curios version is maintained again, so just as I hoped back in July 2024, I can close this issue :-)
See e167572 for the Minecraft 1.21.1 port.