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/modules/materials/material_recipes.dm

@@ -267,14 +267,14 @@
 	..()
 	recipes += new /datum/stack_recipe_list("[display_name] construction",
 		list(
-			new /datum/stack_recipe("phoron floor tile", /turf/simulated/floor/phoron, 1, 4, 20)
+			new /datum/stack_recipe("phoron floor tile", /obj/item/stack/tile/phoron, 1, 4, 20)
 		))
 
 /material/diamond/generate_recipes()
 	..()
 	recipes += new /datum/stack_recipe_list("[display_name] construction",
 		list(
-			new /datum/stack_recipe("diamond floor tile", /turf/simulated/floor/diamond, 1, 4, 20)
+			new /datum/stack_recipe("diamond floor tile", /obj/item/stack/tile/diamond, 1, 4, 20)
 		))
 
 /material/leather/generate_recipes()

code/modules/materials/material_sheets.dm

@@ -7,6 +7,7 @@
 	throw_speed = 3
 	throw_range = 3
 	max_amount = 50
+	recyclable = TRUE // Pretty much all materials should be recyclable
 
 	var/default_type = DEFAULT_WALL_MATERIAL
 	var/material/material

code/modules/materials/material_synth.dm

@@ -4,7 +4,10 @@
 	uses_charge = 1
 	charge_costs = list(1000)
 	gender = NEUTER
-	matter = null // Don't shove it in the autholathe.
+
+	// Don't shove it in the autholathe
+	recyclable = FALSE
+	matter = null
 
 /obj/item/stack/material/cyborg/New()
 	if(..())
@@ -39,4 +42,4 @@
 	As a synthetic, you can gain more reinforced glass by recharging."
 	icon_state = "sheet-rglass"
 	default_type = MATERIAL_GLASS_REINFORCED
-	charge_costs = list(500, 1000)
+	charge_costs = list(500, 1000)