Introduce compatibility with mcl_rubber mod

Closes #1

craftitems.lua

@@ -117,31 +117,33 @@ minetest.register_craft({
 	}
 })
 
-minetest.register_craftitem("industrialtest:sticky_resin",{
-	description=S("Sticky Resin"),
-	inventory_image="industrialtest_sticky_resin.png"
-})
+if not industrialtest.mods.mclRubber then
+	minetest.register_craftitem("industrialtest:sticky_resin",{
+		description=S("Sticky Resin"),
+		inventory_image="industrialtest_sticky_resin.png"
+	})
 
-minetest.register_craftitem("industrialtest:rubber",{
-	description=S("Rubber"),
-	inventory_image="industrialtest_rubber.png"
-})
-minetest.register_craft({
-	type="cooking",
-	output="industrialtest:rubber",
-	recipe="industrialtest:sticky_resin"
+	minetest.register_craftitem("industrialtest:rubber",{
+		description=S("Rubber"),
+		inventory_image="industrialtest_rubber.png"
+	})
+	minetest.register_craft({
+		type="cooking",
+		output="industrialtest:rubber",
+		recipe="industrialtest:sticky_resin"
+	})
+end
+industrialtest.api.registerExtractorRecipe({
+	output=industrialtest.elementKeys.rubber,
+	recipe=industrialtest.elementKeys.rubberWood
 })
 industrialtest.api.registerExtractorRecipe({
-	output="industrialtest:rubber",
-	recipe="industrialtest:rubber_wood"
+	output=industrialtest.elementKeys.rubber,
+	recipe=industrialtest.elementKeys.rubberSapling
 })
 industrialtest.api.registerExtractorRecipe({
-	output="industrialtest:rubber",
-	recipe="industrialtest:rubber_sapling"
-})
-industrialtest.api.registerExtractorRecipe({
-	output="industrialtest:rubber 3",
-	recipe="industrialtest:sticky_resin"
+	output=industrialtest.elementKeys.rubber.." 3",
+	recipe=industrialtest.elementKeys.stickyResin
 })
 
 minetest.register_craftitem("industrialtest:raw_carbon_fibre",{