Countered's Terrain Slabs

Bugfixes:

• Made silk touch drop slabs instead of blocks
• Stone slabs drop cobble
• Fixed Journey Map showing grass slabs as white
• Fixed generation breaking powder snow
• Fixed slab gen updating blocks (breaking kelp)
• Improved gen in snow biome

Features:

• Added dirt path slab 🥳
• Snow can now be placed on slabs (little bit buggy but can't be changed)