niflib: Update with recent nif.xml changes

include/obj/ATextureRenderData.h

include/obj/NiBSplineBasisData.h

include/obj/NiBSplineCompFloatInterpolator.h

include/obj/NiBSplineCompTransformInterpolator.h

include/obj/NiBSplineTransformInterpolator.h

include/obj/NiPersistentSrcTextureRendererData.h

include/obj/NiPixelData.h

include/obj/NiSourceTexture.h

niflib.vcproj

niflib_VC2008.vcproj

src/gen/register.cpp

src/obj/ATextureRenderData.cpp

src/obj/NiBSplineCompFloatInterpolator.cpp

src/obj/NiControllerSequence.cpp

src/obj/NiPersistentSrcTextureRendererData.cpp

src/obj/NiPixelData.cpp

src/obj/NiSourceTexture.cpp