-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