Refractivity; some optimizations

build/engine/shaders/mtrltp/mtrltp_refract.ps

build/engine/shaders/sky/sky_box.ps

proj/SkyXEngine/vs2013/SkyXEngine.sln

proj/sxgreen/sxgreen/sxgreen.vcxproj

proj/sxmtrl/vs2013/sxmtrl.vcxproj

sdks/graphix

source/anim/DynamicModel.cpp

source/anim/DynamicModel.h

source/anim/DynamicModelProvider.cpp

source/anim/DynamicModelShared.cpp

source/anim/DynamicModelShared.h

source/anim/RenderableVisibility.h

source/common

source/game/BaseAnimating.cpp

source/game/BaseEntity.h

source/game/EntityFactory.cpp

source/game/EntityFactory.h

source/game/EntityManager.cpp

source/game/EntityManager.h

source/game/PropStatic.cpp