Completely new system to render facades.
It will now support many more cases compared to the old system.
For example connected textures are now possible, as well as multilayer models and so on.
* Updated Forge to 1.12.2 RB
Updated mappings to the MDK defaults for 1.12.2
Updated related depdencies
* With Forge 14.23 not available for < 1.12.2, we have to drop support.
With one potential fix for TE corruption, this step should be
reasonable.
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