Updated to 1.21.5

Additions:

• Added layers for leaves, sand, gravel, concrete powder, and concrete

  • 1 block crafts 8 layers and 8 layers craft 1 block

  • Up to 8 layers can be placed in one block space, with 8 layers converting to a full block

  • Layers can be placed anywhere a full block can be placed, and do not break if the supporting block is removed (unlike snow layers)

  • Leaf layers can be waterlogged

  • Sand, gravel, and concrete powder layers have gravity

  • Concrete powder layers convert to concrete layers when placed in or next to water