Fix for not being able to download workshop models. Since most meshes now have read/write enabled for memory reasons we can't read the mesh to output the .obj. To fix, there's a new process under Tools/Workshop/Export Workshop Models that outputs all of the skinnable meshes as .obj into the StreamingAssets folder and stores the path to it on the Skinnable object. Then instead of creating the .obj at run time we can just copy the file to the desired directory at run-time.