2. Partial work on multi-material mesh import

Exporter - Fix naming bug when spliting multi-material meshes

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o Exporter
  - Fix Collapse Transforms on dialog so that it actually triggers collapse
  - Change defaults for textures so Morrowind does not crash in CS
  - Fix export of animation for Morrowind
  - Introduce mechanism in Collapse Transforms so that poorly scaled models export better

o Importer
  - Fix import of animation for Morrowind