Removed some dead code

build/engine/textures/dev/dev_white.dds

proj/sxgcore/vs2013/sxgcore.vcxproj

proj/sxgcore/vs2013/sxgcore.vcxproj.filters

proj/sxmtrl/vs2013/sxmtrl.vcxproj

source/gcore/LoaderTextures.cpp

source/gcore/LoaderTextures.h

source/gcore/sxgcore.cpp

source/gcore/sxgcore.h

source/mtrl/IXMaterialSystem.h

source/mtrl/MaterialSystem.cpp

source/mtrl/MaterialSystem.h

source/mtrl/material.cpp

source/mtrl/material.h

source/mtrl/sxmtrl.h

source/render/gdata.cpp

source/render/gdata.h

source/render/sxrender.cpp

source/render/sxrender.h

source/terrax/terrax.cpp