New:

- Refactored Shape Data importing code to take a single codepath regardless of basic or advanced import to reduce complexity.
- Broke Vector -> Byte4 conversion into it's own function for sanity and reduction of complexity
- (In companion commit in other project) - Loading a model now only calculates the missing Tangent data, rather than recalculating Tangent + Binormal + Handedness data;  This brings the visual in Textools closer to XIV with regards to seams, etc.
- Shape data returned to using original from-existant-model data for Binormals/Tangents (which now matches with generated Tangent/Binormal data)

Bugfix/Minor
- Changed calculateTangentData to CalculateTangentData to match case of other functions.
- Cleaned up Tangent/Binormal calculations and added extensive comments.
- Fixed the Vertex->Byte4 conversion for Binormal data to no longer be as lossy. (But converting floats to bytes is alwyas going to suck)

Author: Lunaretic