* Default setting when no tangents rule: MikkT tangents.
* Calculates tangents/bitangents for all available uv sets.
* Creates tangent/bitangent data in in case they are not existing yet (as in: the source scene contains tangents/bitangents)
* Overwrites the tangent/bitangent data from the source scene in case MikkT is wished.
* Added helper functions to create tangent/bitangent scene nodes, finding tangent/bitangent data for a given uv layer and calculating the number of uv layers provided by the mesh scene node.
Signed-off-by: Benjamin Jillich <jillich@amazon.com>
Benjamin Jillich
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