extend overridable graphics/sounds to 8 of each, for lua scripters who really like having their own sprites/sounds. these should not be used in the engine.
foreach(dir
Fonts
Forts
Graphics
Locale
Maps
Missions
Music
Names
Scripts
Sounds
Themes
misc
)
add_subdirectory(${dir})
endforeach(dir)
if(${GL2})
add_subdirectory(Shaders)
endif(${GL2})