Mitigates (autolathe) recycling exploits by minimizing what can be recycled, adding unit tests and fixing the recipes (#10375)

* Mitigates research recycling exploits by minimizing what can be recycled

* Moves the research design check into a new unit test

* Adds unit test for stack material recipes costs and fixes these costs

* Instead of changing recipes the resulting materials are worth less

* Crap fix

code/game/objects/items/stacks/stack.dm

@@ -155,23 +155,7 @@
 			return
 
 	if (use(required))
-		var/atom/O
-		if(recipe.use_material)
-			O = new recipe.result_type(user.loc, recipe.use_material)
-		else
-			O = new recipe.result_type(user.loc)
-		O.set_dir(user.dir)
-		O.add_fingerprint(user)
-
-		if (istype(O, /obj/item/stack))
-			var/obj/item/stack/S = O
-			S.amount = produced
-			S.update_icon()
-			S.add_to_stacks(user)
-
-		if (istype(O, /obj/item/storage)) //BubbleWrap - so newly formed boxes are empty
-			for (var/obj/item/I in O)
-				qdel(I)
+		recipe.Produce(produced, user.loc, user.dir, user)
 
 /obj/item/stack/Topic(href, href_list)
 	..()
@@ -388,6 +372,30 @@
 	src.on_floor = on_floor
 	src.use_material = supplied_material
 
+/datum/stack_recipe/proc/Produce(var/amount = 1, var/loc = null, var/dir = NORTH, var/user = null)
+	if(amount < 1)
+		return null
+
+	var/atom/O
+	if(use_material)
+		O = new result_type(loc, use_material)
+	else
+		O = new result_type(loc)
+	O.set_dir(dir)
+	O.add_fingerprint(user)
+
+	if (istype(O, /obj/item/stack))
+		var/obj/item/stack/S = O
+		S.amount = amount
+		S.update_icon()
+		if(user)
+			S.add_to_stacks(user)
+
+	if (istype(O, /obj/item/storage)) //BubbleWrap - so newly formed boxes are empty
+		for (var/obj/item/I in O)
+			qdel(I)
+	return O
+
 /*
  * Recipe list datum
  */
@@ -397,4 +405,4 @@
 
 /datum/stack_recipe_list/New(new_title, new_recipes)
 	src.title = new_title
-	src.recipes = new_recipes
+	src.recipes = new_recipes