Sun game object; emissive materials demo

build/demos/levels/transparent/transparent.ent

build/demos/levels/transparent/transparent.lvl

build/demos/materials/box/box_mtl_lit.mtl

build/demos/meshes/box/box_mtl_lit.dse

build/demos/textures/box/box_mtl_lit.dds

build/demos/textures/box/box_mtl_lit.psd

build/demos/textures/mtl/mtl_box_big.dds

proj/sxgame/vs2013/sxgame.vcxproj

proj/sxgame/vs2013/sxgame.vcxproj.filters

source/game/LightDirectional.h

source/game/LightSun.cpp

source/game/LightSun.h

source/light/ShadowCache.h