Basic decals

build/engine/config/decals/decals.cfg

build/engine/textures/decal/decal_test.dds

build/engine/textures/decal/decal_test2.dds

build/engine/textures/decal/decal_test3.dds

proj/sxanim/vs2013/sxanim.vcxproj

proj/sxanim/vs2013/sxanim.vcxproj.filters

source/anim/Decal.cpp

source/anim/Decal.h

source/anim/DecalProvider.cpp

source/anim/DecalProvider.h

source/anim/DynamicModel.cpp

source/anim/DynamicModel.h

source/anim/DynamicModelProvider.cpp

source/anim/ModelOverlay.cpp

source/anim/ModelOverlay.h

source/anim/Renderable.cpp

source/anim/Renderable.h

source/anim/RenderableVisibility.cpp

source/anim/RenderableVisibility.h

source/anim/Updatable.cpp