-Fixed chests rendering in inventory (kinda).
-Fixed stairs rendering.
From now on, all blocks with multiple states MUST have item model.
Example stair provided (though with incorrect textures).
Relates to #9.
-Externalized FacingToRotation.
-BlockLightDetector now uses tile based rotations.
-Added TESR methods and TESRs for chests. Can't get it to work in
inventory.
-Fixed rotation bugs involving culling and lighting. Now rotating culled
faces and normals too. Closes#21.
Relates to #9, #10 and #20.
Implemented passing of rotations to models. Removed unused unlisted
properties. Included dummy grinder model. Found bugs that have to be
fixed.
Referencing #10.