Some refactoring

build/engine/shaders/const.h

build/engine/shaders/gi/gi_cubes.gs

build/engine/shaders/gi/gi_cubes.ps

build/engine/shaders/gi/gi_cubes.vs

build/engine/shaders/gi/gi_inject.vs

build/engine/shaders/gi/gi_inject_cube.vs

build/engine/shaders/lighting/lighting_bound.vs

build/engine/shaders/lighting/lighting_com.ps

build/engine/shaders/lighting/lighting_gi.ps

build/engine/shaders/material/gbuffer.ps

build/engine/shaders/pp/pp_res_pos.vs

build/engine/shaders/ppgensm/ppgensm_direct.ps

build/engine/shaders/ppgensm/ppgensm_pssm.ps

build/gamesource/shaders/dbg/dbg_colorvertex.vs

proj/sxgcore/vs2013/sxgcore.vcxproj

proj/sxgcore/vs2013/sxgcore.vcxproj.filters

proj/sxlight/vs2013/sxlight.vcxproj

proj/sxlight/vs2013/sxlight.vcxproj.filters

proj/sxrender/vs2013/sxrender.vcxproj

proj/sxrender/vs2013/sxrender.vcxproj.filters