ModernFix

Depending on the size of this release, there may be a human-readable changelog available on the wiki page.

Changes since 5.20.0+1.20.1

• Prevent crash when server sends invalid palette - embeddedt
• Modernize toolchain - embeddedt
• Prevent sculk events in addPassenger from deadlocking the game during worldgen - embeddedt
• Add debug feature to catch illegal block entity map mutation - embeddedt