[2.8.0] Support for MC 1.21.6

Majors changes :

• Add waxed property (usable from MC 1.20.1).
• Add support for Minecraft 1.21.6 (no new properties).

Minors changes :

• Fix some mistakes in the wiki (thanks to orangejuiceyummy for reporting the errors):
  • Lightable,
  • Bisected.