Solid Globar Branches

Added:

• Programmer Art, alternate branch models: either completely flat/straight, or bumpy but without twigs

Fixed:

• Globar Branches on grown trees now always have the correct 'facing' value.
• Amber and Amber Glass are now considered equal to their Glowing variants w.r.t. rendering.

Changed:

• Adjusted model weights in blockstates json
• Slightly improved performance of the branch model