We can't have functions on compounds as all files for them are generated.  Removed CalcNumTriangles so Niflib programs will link.

Split some things that were previously part of NIF_IO.h into their own files to make SWIG wrapping work better.

Changed near and far to nearExtent and farExtent in LODRange to prevent conflicts with defines in Windows standard library.

Made ShortString an intrinsic type to fix problems with writing them.
Removed extra byte in HeaderString NifStream function.

Commented out functions written by Amorilia that I need to figure out how to fix.