niflib: Update niflib from current nif.xml

include/gen/BoundingVolume.h

include/gen/BoxBV.h

include/gen/ByteMatrix.h

include/gen/CapsuleBV.h

include/gen/ChannelData.h

include/gen/HalfSpaceBV.h

include/gen/MorphWeight.h

include/gen/OblivionSubShape.h

include/gen/SkinPartition.h

include/gen/SkinShape.h

include/gen/SphereBV.h

include/gen/TexSource.h

include/gen/UnionBV.h

include/gen/enums.h

include/gen/enums_intl.h

include/obj/NiBoneLODController.h

include/obj/NiCollisionData.h

include/obj/NiCollisionObject.h

include/obj/NiGeomMorpherController.h

include/obj/NiGeometry.h