niflib: Update to latest nif.xml

include/gen/enums.h

include/nif_math.h

include/obj/NiPSysColliderManager.h

include/obj/NiSwitchNode.h

include/obj/bhkBvTreeShape.h

niflib_VC2008.vcproj

src/gen/enums.cpp

src/nif_math.cpp

src/obj/NiGeomMorpherController.cpp

src/obj/NiPSysColliderManager.cpp

src/obj/NiSwitchNode.cpp

src/obj/bhkBvTreeShape.cpp