Immersive Weathering Leaf Piles Fix

Added support for:

• Oh The Biomes We've Gone
• Alex's Caves
• The Aether
• Twilight Forest

Improved textures:

• Made use of bespoke leaf pile textures for vanilla blocks for derivative modded leaf blocks.
• Corrected some odd background colours for heavy leaf piles.

Other improvements:

• Corrected names for Quark Ashen and Trumpet leaf piles and bark items.
• Biomes o' Plenty Null Leaf piles have a properly obfuscated name and blockstate behaviour that matches the Null leaf block.
• Biomes o' Plenty's Rainbow Birch leaf pile item is correctly coloured in the inventory.
• Biomes o' Plenty Hellbark Bark is now just called Hellbark.