add empty spool (craft from 7 plastic sheet)

make steel and copper wire use it.
reworked existing spool images

homedecor/crafts.lua

@@ -78,6 +78,11 @@ minetest.register_craftitem("homedecor:dvd_player", {
 	inventory_image = "homedecor_dvd_player.png"
 })
 
+minetest.register_craftitem("homedecor:empty_spool", {
+	description = S("Empty wire spool"),
+	inventory_image = "homedecor_empty_spool.png"
+})
+
 minetest.register_craftitem("homedecor:copper_wire", {
 	description = S("Spool of copper wire"),
 	inventory_image = "homedecor_copper_wire.png"
@@ -206,21 +211,26 @@ minetest.register_craft( {
     },
 })
 
+minetest.register_craft( {
+    output = "homedecor:empty_spool 2",
+    recipe = {
+		{ "homedecor:plastic_sheeting", "homedecor:plastic_sheeting", "homedecor:plastic_sheeting" },
+		{ "", "homedecor:plastic_sheeting", "" },
+		{ "homedecor:plastic_sheeting", "homedecor:plastic_sheeting", "homedecor:plastic_sheeting" }
+    },
+})
+
 minetest.register_craft( {
     output = "homedecor:steel_wire 4",
     recipe = {
-		{ "", "homedecor:plastic_sheeting", "" },
-		{ "default:steel_ingot", "homedecor:plastic_sheeting", "default:steel_ingot" },
-		{ "", "homedecor:plastic_sheeting", "" }
+		{ "default:steel_ingot", "homedecor:empty_spool", "default:steel_ingot" },
     },
 })
 
 minetest.register_craft( {
     output = "homedecor:copper_wire 4",
     recipe = {
-		{ "", "homedecor:plastic_sheeting", "" },
-		{ "default:copper_ingot", "homedecor:plastic_sheeting", "default:copper_ingot" },
-		{ "", "homedecor:plastic_sheeting", "" }
+		{ "default:copper_ingot", "homedecor:empty_spool", "default:copper_ingot" },
     },
 })