Removed unused vars from UpdateTangentSpace().

1. Update NiStencilProperty based on Shon's changes
2. Rewrote large chunks of WriteFileGroup related routines.
3. Added a WriteNifTree which allows for multiple roots (not exposed publically)
4. Added option to BindSkin to scene instead of skeleton root.
5. Fixed bug in RemoveController
6. Added helpers to NiControllerManager for sequence management
7. Propegated user_version in routines which take a version

1. Update NiStencilProperty based on Shon's changes
2. Rewrote large chunks of WriteFileGroup related routines.
3. Added a WriteNifTree which allows for multiple roots (not exposed publically)
4. Added option to BindSkin to scene instead of skeleton root.
5. Fixed bug in RemoveController
6. Added helpers to NiControllerManager for sequence management
7. Propegated user_version in routines which take a version

2. Fix PCH project settings.
3. Add NifSkope base partitioning algorithm
4. Add ability to use TriStripper instead of NvStripper for tristripdata
5. Sync with XML and equivalent changes.

Updated method names to use 'LOD'.
Added documentation comments.

Really put the skin calculations back the way they were this time.  Helps, but the hands of better bodies meshes still end up in the wrong place.
Added transform parameter to ComplexShape::Split because changing the transforms after the fact ruins the skin binds.

Added missing NvTriStripper files back into solution.

Updated NiScreenLODNode in Nif.xml to use 'ProportionLevels'.