Sandstone Recycling v1.4 (1.20-1.20.6)

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Split pack into 1.20.x, 1.21-1.21.8 and 1.21.9-1.21.10 versions
Updated file names to better reflect recipes
Cleaned up recipe unlock advancements
- Recipe unlocks now make more sense (e.g., now sandstone slab unlocks smelting to smooth sandstone slabs vs. before smooth sandstone slab unlocked smelting to smooth sandstone slabs)
- Added specific recipe unlock advancements for stairs, slabs, walls, and other variations
Added recipes for turning sandstone and red sandstone slabs back into their respective sandstone variants
- Slabs for sandstone and red sandstone must be placed side-by-side in the crafting grid so the recipe does not conflict with chiseled sandstone (this does not apply to smooth sandstone)