A bunch of improvements

*Updated UI to match latest minetest-game
*An extra row of items, so less pages
*Option to filter items, so no more scrolling through 100 pages
*Option to show item strings ("default:glass") as tooltips
*Option to show all items, not just craftable items
*Show number of items output by craft (with itemstrings only for now)
*Probably some other things I forgot