Using return values of actions AddItem and AddBlock as Recipe values, Action to get ItemStack to use in Recipes

[SvenKayser]

As of now, Recipes allow only rather unintuitively to use strings as values, and even tho if the action to create an Item or Block has been cached, it cannot be used as a value for recipe creation. This should be possible - also getting an itemstack via an Action an using the cached result in recipes.