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.
* Fixes#2680: Use a shorter cable anchor model when blocked by a facade.
* Fixes#2664: Prevent anchors from creating intersection.
Replaced the simple List<ResourceLocation> for the static models with a
new container also indicating a solid part, which can be used to prevent
the creation of an intersection.
yueh