- Fix issue with exporting Skin data causing missing vertexes in nifskope
   - add helper methods for collision related export.
   - fix crashes when exporting animation

Add helper methods to transform shape and fix some typos.

Add miscellaneous collision support helper methods

It seems that a NIF file with NULL property links is still able to be opened by the game engine, so added tests for this in a few places rather than assuming that all links are not NULL.

Added more NormalizeKeys functions.
Added some other functions to some controllers to expose their data.

Separated reference counting features of NiObject into new RefObject class.  This way they won't be buried in the obj folder.
Started adding NormalizeKeys functions to data objects, interpolators, and controllers that deal with keys.  Not yet finished.

Fixing paths in MatTexCollection.cpp to be relative.

Deleting RagDollDescriptor.cpp and RagDollDescriptor.h so that they can be replaced with versions that don't use a capital R.  Seems someone changed the case of this object in the XML file after it had already been included in Niflib.

Forgot to mention it in a previous commit, but I added some template functions for extracting flags and fields from bitfields to NIF_IO.h.  I just put them through some tests and they appear to work correctly.

Finished new MatTexCollection helper class which makes it possible to manipulate material properties and texture objects with the same classes regardless of the intended NIF version.
Realized that only read was implemented for files with version < 3.3.0.13, so implemented write for those old versions as well.

Since there seemed to be no way to make pre-main initialization work for statically linking the library, I went back to using a CPP file that includes all the NiObject files and registers each one with the ObjectRegistry.

Moved Object Registration/Creation functionality into new ObjectRegistry class.  Hopefully this fixes the issue with the object map not being initialized yet since it is a static member of the class and should theoretically be initialized before code in functions of that class can be executed.  Seems to work for me, but I'll wait until Tazpn tests it to declare it fixed.

- There are no longer any defines, things like inheritance class name, NIF attribute variables, and default constructor code are all visible without looking at another file.
- All non-custom parts of the Object files are now totally identical and in the same order, so it will be easier to compare them.
- NiObjects are now completely self-contained.  To remove them from Niflib, you have only to exclude their CPP file from the build.  To add new ones, you only have to include their new CPP file.
- Making a change to a NiObject implementation file only causes that one file to be re-compiled, which is generally much quicker than before since the large obj_define and obj_impl files do not have to be parsed or compiled.
- There are no longer any "Internal" versions of the Read, Write, asString, FixLinks, or GetRefs functions.  Now there is just one function for each of these with pre and post custom code areas (except for GetRefs which I didn't think needed it.)
- Updates to the hierarchy in the XML should now be almost completely automatic.  All that should be necessary to make an update is to add any new NiObject CPP files to the build.
- Changes to the generated parts of the NiObject files can now be made at any time, and immediately applied to all NiObjects without editing each existing one.

Preparing for new Python generation method.  Will break compilation for a while.  obj_defines.h and obj_impl.cpp will no longer be necessary once this is complete. 

Updated Niflib to the latest XML.  This significantly improves the hierarchy and adds support for BSWindModifier.

Updated to the latest XML, which adds support for NiBinaryVoxelExtraData, NiBinaryVoxelData, NiPSysCollider, NiBone, NiPSysSphericalCollider, and NiTriShapeSkinController.
Removed erroneous bhkMeshShape object.
Added support in the version parsing functions for versions such as "3.03" which were being parsed as "3.3.0.0" before.  These will now be parsed as "3.0.3.0."
All Bridge Commander demo NIF files other than those that contain voxel 3D textures can now be read.
All DAoC demo NIF files except those of version 2.3 and those that do not appear to store NIF data can now be read.