Merge branch 'decals' into 'branchX'

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

docs/gen-entity.js

proj/sxanim/vs2013/sxanim.vcxproj

proj/sxanim/vs2013/sxanim.vcxproj.filters

proj/sxgame/vs2013/sxgame.vcxproj

proj/sxgame/vs2013/sxgame.vcxproj.filters

proj/terrax/vs2013/terrax.vcxproj

proj/terrax/vs2013/terrax.vcxproj.filters

source/anim/AnimatedModelProvider.cpp

source/anim/AnimatedModelProvider.h

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