Various nif save fixes and xml sync.

Add release script.

Preparing the 0.8.0 release.

Sync with Ethatron's updates.

Bugfix for writing numuvsets (aka the dreaded 4097 issue for Skyrim exports).

Sync to latest xml (fixes bug when writing NiSkinPartition blocks).

Project fixes for MSVC.

changes for nifutils

Note:
Manually resolved one conflict in NiGeometryData Get/SetTspaceFlags.
All other conflicts resolved via gen_niflib.py.

Conflicts:
	include/gen/enums.h
	include/gen/enums_intl.h
	include/obj/BSBehaviorGraphExtraData.h
	include/obj/BSEffectShaderProperty.h
	include/obj/BSLagBoneController.h
	include/obj/BSLightingShaderProperty.h
	include/obj/BSLightingShaderPropertyFloatController.h
	include/obj/BSMultiBoundAABB.h
	include/obj/BSSegmentedTriShape.h
	include/obj/BSXFlags.h
	include/obj/NiObjectNET.h
	src/gen/Header.cpp
	src/gen/enums.cpp
	src/obj/BSEffectShaderProperty.cpp
	src/obj/BSLagBoneController.cpp
	src/obj/BSLightingShaderProperty.cpp
	src/obj/BSMultiBoundAABB.cpp
	src/obj/NiGeometryData.cpp
	src/obj/NiObjectNET.cpp
	src/obj/NiPSysData.cpp
	src/obj/NiParticlesData.cpp

This reapplies a change from 7988a5cd,
which was accidently reverted in 4a8c4c5a.

Update to latest xml and fixes by skyfox69. Merge with new master from amorilia

BSLightingShaderProperty: remove unknown parameters from API (need to add these back with actual names from nifxml); warn about unknown API.

BSLightingShaderProperty: Unknown Float Set 5 -> Sparkle Parameters (see nifxml commit eb44a85334c1e3f89522de62f8fd14549f74c47d).

BSLightingShaderProperty: Environment Map Strength -> Environment Map Scale (see nifxml commit eb44a85334c1e3f89522de62f8fd14549f74c47d).

BSLightingShaderProperty: Unknown Int 7 -> Texture Clamp Mode (see nifxml commit eb44a85334c1e3f89522de62f8fd14549f74c47d).

Emissive Saturation -> Emissive Multiple (see nifxml commit eb44a85334c1e3f89522de62f8fd14549f74c47d).