Vanilla Backport Compat

Beta for 1.21.1 to bring it up to date with the 1.20.1 version. It also includes compatibility with Snow Real Magic and adds fallen leaf particle generation to leaf blocks from other mods.

And a small change, these blocks no longer generate fallen leaf particles because they don’t have a colormap, which caused the particles to appear gray: (I'll probably fix this in the future)

• Larch leaves (Regions Unexplored) don't spawn falling leaves anymore
• Dead Pine leaves (Regions Unexplored) don't spawn falling leaves anymore

The release will be packed with content, stay tuned for the next update!