Removed some obsolete code

proj/sxrender/vs2013/sxrender.vcxproj

proj/sxrender/vs2013/sxrender.vcxproj.filters

source/SkyXEngine.h

source/editors_utils/axes_static.cpp

source/editors_utils/axes_static.h

source/editors_utils/grid.cpp

source/editors_utils/grid.h

source/render/camera_update.cpp

source/render/camera_update.h

source/render/gdata.cpp

source/render/gdata.h

source/render/render_func.cpp

source/render/render_func.h

source/render/sxrender.cpp

source/render/sxrender.h

source/skyxengine.cpp

source/terrax/terrax.cpp