Add vtk obj importer
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Add vtkOBJImporter class and associated test.
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Allow importing material info from *.mtl files that are associated with *.obj files.
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Handle more cases of .obj file format, such as interleaved geometry defintions (switching back and forth between actors and multiple polydata)
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fetch test data and verify md5 checksum.
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example of imported data from MiG-35.obj + MiG-35.obj.mtl files: