ModernFix

Depending on the size of this release, there may be a human-readable changelog available on the wiki page.

Changes since 5.11.0+1.20.4

• Retrieve quads on incorrect cullface lists if direction matches - embeddedt
• Fix nixie tubes being invisible with faster_item_rendering - embeddedt
• Remove dynamic item overrides - embeddedt
• Update mixin - embeddedt
• Fix incorrect merge - embeddedt
• Update mixin target - embeddedt
• Handle missing models in item overrides - embeddedt
• Work around Flywheel leaving freed buffers in BufferBuilder - embeddedt