Automatable Grindstone

This suggestion is to allow hoppers and droppers to put enchanted or damaged items items into a grindstone, and to allow hoppers to pull out disenchanted or repaired items out.

When disenchanted items are pulled out by hopper, the XP is stored in the grindstone until the next time some disenchanted item is pulled out manually by the player, at which time it spills out as XP Orbs.