Added a common ancestor class "DropSpenser" that has the common code for dropper and dispenser and is Lua-accessible, too. The Debuggers plugin now triggers both droppers and dispensers when rclking them with a redstone torch.
git-svn-id: http://mc-server.googlecode.com/svn/trunk@1514 0a769ca7-a7f5-676a-18bf-c427514a06d6
