Renamed INode functions dealing with bind position so that each function clearly expresses the type of matrix its dealing with - local or world.

Renamed TextureSource to TexSource and Texture to TexDesc.

Renamed Color structure to Color4.

Re-implemented NiMorphData with NifStream function, fixing a bug in its Write function at the same time.
Changed several of the attributes of NiPixelData to attributes in preparation for creating an interface for it.

Fixed error that caused an invalid number to be written in the unknown 4 floats within NiSkinData.  Now simply write 4 zeros.

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.

Added IsController function.

Synced supported blocks to the DocSys, adopting the new position of the AParticleModifier block.

Changed attr_nodeancestor to attr_controllertarget and fixed it so it recognizes any controllable block, not just nodes.
Made all struct types consistent with proper constructors.
Cleaned up the attributes a bit, inheriting some from others so that code isn�t duplicated and special arguments are no longer needed to create any type of attribute.

Fixed AShapeData::SetVertexCount to allow for zero normals and/or colors.  Removed some other recent changes.