Almost rewrite litematic handling

[ZacSharp]

• Some cleanup and diff noise for loading litematics from file system
• Keep subregions separate when loading litematics from file system (but the builder doesn't make use of this...)
• Don't load litematics from file system for #litematica
• #litematica now supports subregion rotation/mirror/translation and even edited schematics

I did not test with multiple litematica versions so I do not know how this behaves with regard to pre-rewrite/post-rewrite differences.

closes #4379