Visual Distinctions (for Mapmakers)

Updates implemented, primarily from community feedback on Youtube (thanks everyone!)

• By popular request, Petrified Oak Slabs now have the old Alpha Oak Planks texture
• A full block of 8 Snow Layers is now distinguishable from the regular Snow Block
• Leaves now have visual differences to distinguish between Supported (default texture), Unsupported (some leaves missing), and Persistent (no transparent pixels).