1. Add skyrim specific checks and modification support.

MaxNifTools.ini

MaxNifTools.iss

NifCommon/AppSettings.cpp

NifCommon/AppSettings.h

NifExport/Exporter.cpp

NifExport/Exporter.h

NifExport/Mesh.cpp

NifExport/MtlTex.cpp

NifExport/NifExport.cpp

NifExport/Util.cpp

NifImport/ImportCollision.cpp

NifImport/ImportMtlAndTex.cpp

NifImport/NIFImport.cpp

NifImport/NIFImporter.h