Add support for ethereal (orange ingredient)

depends.txt

@@ -4,3 +4,4 @@ farming
 farming_plus?
 vessels
 flowers?
+ethereal?

init.lua

@@ -2,8 +2,13 @@
 --By: Philipbenr--
 --Licence: GPLv3--
 
+local orange_ing = "farming_plus:orange"
+if minetest.get_modpath("ethereal") then
+	orange_ing = "ethereal:orange"
+end
+
 ing = {
-	orange = "farming_plus:orange",
+	orange = orange_ing,
 	apple = "default:apple",
 	meat = "mobs:meat",
 	bread = "farming:bread",