Fix subdivision scheme and normal interpolation on export #196
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Set subdivision scheme to "none" and explicity set normal interpolation to "vertex". This fixes #192 but will need additional changes for "USD roundtrip" scenarios where keeping the subdiv scheme is desired. I think that is a problem for later since such a round trip would also require proper support for faceVarying attributes being carried through / reconstructed on export if desired.
Current state of this should potentially be added to the docs to make it more clear what "roundtrip" means and what export currently does.