niflib: Update to latest nif.xml and related fixes

include/gen/TexDesc.h

include/gen/enums.h

include/gen/enums_intl.h

include/obj/NiBSAnimationNode.h

include/obj/NiControllerSequence.h

include/obj/NiFlipController.h

include/obj/NiPathController.h

include/obj/NiStencilProperty.h

include/obj/NiTextureTransformController.h

include/obj/NiUVData.h

include/obj/NiZBufferProperty.h

include/obj/bhkRigidBody.h

src/gen/BodyPartList.cpp

src/gen/BoundingVolume.cpp

src/gen/ChannelData.cpp

src/gen/Morph.cpp

src/gen/OblivionColFilter.cpp

src/gen/OblivionSubShape.cpp

src/gen/TexDesc.cpp

src/gen/enums.cpp