rework the mtl file handling for obj/mtl files
also add a new exporter designed to work with obj file although it will work with any scene in vtk. The new exporter takes all the actors in a scene and stores them as a single vtp file. It also takes all the texturs and combines them into a single texture. The exporter is designed to take OBJ files that may consist of mulitple parts each with their own texture and convert them into a singlke vtp file so that they are easier to work with in ParaView/etc.
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