The Aether: Redux

ALPHA.4.3! This is a small-ish patch, fixing a few things and improving the wood colors.

CHANGELOG:

• Added Sporing Blightwillow Wood
• Updated the colors for Blightwillow and Crystal wood items and blocks
• Added some missing textures from the Classic Nature built-in resource pack
• Fixed a crash caused by Blightwillow wood not being registered, causing the game to crash when placing a Blightwillow Sign