Fix issue # 2571: extra layer for multi uv sets #2572
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This pull request is to fix issue 2571 #2571
A scene with mesh that has two uv sets. When loaded using aiImport, it shows correctly. Somehow after aiExport and re-import again use aiImport, there is one uv map left. I think the aiImport is working correctly as originally the two uv sets are all imported. But after aiExport, one uv gets lost.
After diving into the FBXExport.cpp code, it seems multi uv sets is a TODO task (comments in code). To fix that, just add extra LayerElementUV for extra uv map.