Add an air and ores item group (usable in /fill). (#)

Add minecraft:air, minecraft:cave_air, minecraft:void_air, and any other airs that may be added to a group titled #minecraft:air or #minecraft:airs, in similarity to those such as #minecraft:base_stone_overworld and #minecraft:wool, which are useful in filling things. Also, #minecraft:ores would be useful, just for slightly speeding up anything. It would also be nice to have every block have many tags, but that may just be a dream.