Make new metals actually possible to get

mods/crafting/recipes.lua

@@ -85,7 +85,7 @@ crafting.register_craft(
       output = "default:ingot_steel 2",
       items = {
          "default:lump_coal",
-         "default:ingot_steel 4",
+         "default:ingot_wrought_iron 4",
       }
 })
 

mods/default/crafting.lua

@@ -45,6 +45,8 @@ minetest.register_craft(
       cooktime = 6,
 })
 
+-- Metal smelting
+
 minetest.register_craft(
    {
       type = "cooking",
@@ -53,6 +55,22 @@ minetest.register_craft(
       cooktime = 3,
 })
 
+minetest.register_craft(
+   {
+      type = "cooking",
+      output = "default:ingot_tin",
+      recipe = "default:lump_tin",
+      cooktime = 3,
+})
+
+minetest.register_craft(
+   {
+      type = "cooking",
+      output = "default:ingot_copper",
+      recipe = "default:lump_copper",
+      cooktime = 3,
+})
+
 minetest.register_craft(
    {
       type = "cooking",