Procedural animated texture generation/Clocks

To generate its appearances, the clock combined 2 textures, one being the actual clock, and the other being the dial.

Due to an oversight with how assets were loaded however, the item sprite for clocks couldn't be overridden by texture packs (as they are set to always load from the vanilla gui/items.png atlas, stored in minecraft.jar, rather than the one of the currently active texture pack.