-Renamed LocationKey to ModelKey and added another field so that cached values are correct for objects using the same models.
-Implemented shading to the scene.
-Implement full SceneTilePaint with variable colors and textures.
-Implement textures while rendering SceneTileModel
-Enable maps to be loaded by their region id instead of just their coordinates.
-Implement full object model creation (replacement colors, replacement textures, resizing, translation)
-Added two new methods to ModelDefinition used in object model creation.
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