[Bf-python] Update/ OBJ.

[Campbell Barton]

Hi, Fixed a bug in OBJ importer (Thanks Manual) when importing a null 
material.

And used Mathutils in the exporter to transform Verts and vert normals, 
should speed things up somewhat.
Also renamed to Conform to suggested name format.

#==================#
# Apply Transform  #
#==================#
def apply_transform(vert, matrix):
    vert.resize4D()
    # The vert is now 4 length but we just ignore the 4th value when 
writing new the vert pos.
    return Mathutils.VecMultMat(vert, matrix)
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