-Removes the unused/dumb access stuff from space cash.
-Fixes a bug where dice would vanish if you used a hand labeller on them.
-Moves space cash/coins/mint sprites into their own file, economy.dmi. Moves mineral sheets into mining.dmi.
-Coins are flippable! Features unique flipping sprites and sound effects, and two-headed coins.
-Oh and better sprites for wooden closets too.
-Reduced the chunks of code about minerals in door_assembly.dm
Preeeetty much this commit is just to update all the files to the new path of the minerals. From here, if I can, I'll start changing one by one to remove the huge chunks of code.
git-svn-id: http://tgstation13.googlecode.com/svn/trunk@5087 316c924e-a436-60f5-8080-3fe189b3f50e