Added DX_CALL macro for validating DX call results

proj/SkyXEngine/vs2013/SkyXEngine.sln

source/anim/animated.cpp

source/decals/DecalManager.cpp

source/game/Tracer.cpp

source/game/crosshair.cpp

source/game/sxgame_dll.cpp

source/gcore/sxgcore.cpp

source/gcore/sxgcore.h

source/gui/Desktop.cpp

source/gui/Font.cpp

source/gui/GUIbase.h

source/gui/IRenderBorder.cpp

source/gui/IRenderFrame.cpp

source/gui/SXGUI.cpp

source/gui/ScrollBarSimple.cpp

source/gui/Texture.cpp

source/gui/VideoRenderer.cpp