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.
City.ogg=HSR ( http://elhombresinremedio.com )
Compost.ogg=HG
EarthRise.ogg=Jonatan Nilsson
Nature.ogg=John Dum
Pirate.ogg=Jonatan Nilsson
Rock.ogg=HSR ( http://elhombresinremedio.com )
olympics_sd.ogg=yd ( http://opengameart.org/users/yd )
oriental.ogg=Jonatan Nilsson
sdmusic.ogg=Kevin MacLeod - "Hitman" [sheepluva edit]
snow.ogg=Jonatan Nilsson