Implemented Color3 object.
Adjusted project settings to make the Maya importer link faster.

Updated license text in remaining files.  Short text in all files except niflib.h, and year updated to 2006.

Removed BoneToMatrix44 helper functions. (They will be implemented in Python in the Blender exporter.)

Added a function to calculate an X-aligned bone matrix from the bone vector and the bone roll, which is convenient to have for the Blender exporter.

Changed Float3, Matrix33, and Matrix44 from C arrays to structures that mimic C arrays ensure accessibility from scripting languages.