Added ingot group to all ingots

- Solves #201

mods/3d_armor_classes/blackmithril/init.lua

@@ -33,6 +33,7 @@ minetest.register_craftitem(":3d_armor:blackmithril_ingot", {
 	description = "Black Mithril Ingot",
 	inventory_image = "3d_armor_blackmithril_ingot.png",
 	stack_max = 99,
+	groups = {ingot = 1}
 })
 
 -- Black Mithril craft recipe

mods/moreores/init.lua

@@ -146,6 +146,7 @@ local function add_ore(modname, description, mineral_name, oredef)
 		minetest.register_craftitem(ingot, {
 			description = S("%s Ingot"):format(S(description)),
 			inventory_image = img_base .. "_ingot.png",
+			groups = {ingot = 1}
 		})
 		minetest.register_alias(mineral_name .. "_ingot", ingot)
 	end