niflib: synchronize to latest nif.xml

Makefile

include/gen/OblivionSubShape.h

include/gen/ParticleDesc.h

include/gen/hkTriangle.h

include/nif_math.h

include/obj/NiLODNode.h

include/obj/NiLightIntensityController.h

include/obj/NiMeshPSysData.h

include/obj/NiPSysAirFieldModifier.h

include/obj/NiPSysData.h

include/obj/NiPSysDragFieldModifier.h

include/obj/NiPSysFieldMagnitudeCtlr.h

include/obj/NiPSysFieldModifier.h

include/obj/NiPSysGravityFieldModifier.h

include/obj/NiPSysTurbulenceFieldModifier.h

include/obj/NiPSysVortexFieldModifier.h

include/obj/NiParticlesData.h

include/obj/NiPortal.h

include/obj/NiRoom.h

include/obj/NiRoomGroup.h