Implemented missing functions.

docsys_extract.cpp

nif_math.cpp

niflib.cpp

niflib.vcproj

obj/APSysData.cpp

obj/NiAVObject.cpp

obj/NiCollisionObject.cpp

obj/NiControllerSequence.cpp

obj/NiObject.cpp

obj/NiObject.h

obj/NiSkinInstance.cpp

obj/NiStringExtraData.cpp

obj/TriBasedGeomData.cpp

obj/Type.cpp