By adding cobbled deepslate to the group "cobble", it automatically
inherits all crafting recipes and tool repair capabilities that apply
to that group.
* Add `cobble=1` to cobbled deepslate node definition groups. This
requires a little refactoring of the deepslate variants registration
function.
* Remove stone tools, furnace and brewing stand crafting recipes.
* Register "cooking" crafting recipe for deepslate ores that enables
smelting these ores in furnaces.
* Extend deepslate ore registration function to allow passing cooking
result as argument.
* Update the deepslate ore table to include smelting results.
* Put deepslate w/ lapis drops in a separate table, making the deepslate
ores table less unwieldly.
The discussion about how to handle the new ores is still ongoing.
This PR was originally only intended to add the new nodes so
that's what it does now.
