More buildables, some fixes, upgradable smartfridge

- Fuel is now available in the tier 4 reagent list for buildable chem
dispensers.
- Seed extractor, gibber, and recycler can be built, but having better
stock parts has no effect.
- Smartfridge can hold up to 1500 items by default instead of 999,
upgrading matter bin allows it to hold more.

code/modules/reagents/Chemistry-Machinery.dm

@@ -294,7 +294,7 @@
 	var/list/special_reagents = list(list("hydrogen", "oxygen", "silicon", "phosphorus", "sulfur", "carbon", "nitrogen", "tungsten", "water"),
 						 		list("lithium", "sugar", "copper", "mercury", "sodium","iodine","bromine"),
 								list("ethanol", "chlorine", "potassium", "aluminum","plasma", "radium", "fluorine", "iron", "silver"),
-								list("oil", "ash", "acetone", "saltpetre", "ammonia", "diethylamine"))
+								list("oil", "ash", "acetone", "saltpetre", "ammonia", "diethylamine", "fuel"))
 
 /obj/machinery/chem_dispenser/constructable/New()
 	..()

code/modules/research/designs/machine_designs.dm

@@ -242,6 +242,26 @@
 	build_path = /obj/item/weapon/circuitboard/rdserver
 	category = list("Research Machinery")
 
+/datum/design/gibber
+	name = "Machine Design (Gibber Board)"
+	desc = "The circuit board for a gibber."
+	id = "gibber"
+	req_tech = list("programming" = 1)
+	build_type = IMPRINTER
+	materials = list("$glass" = 1000, "sacid" = 20)
+	build_path = /obj/item/weapon/circuitboard/gibber
+	category = list ("Misc. Machinery")
+
+/datum/design/smartfridge
+	name = "Machine Design (Smartfridge Board)"
+	desc = "The circuit board for a smartfridge."
+	id = "smartfridge"
+	req_tech = list("programming" = 1)
+	build_type = IMPRINTER
+	materials = list("$glass" = 1000, "sacid" = 20)
+	build_path = /obj/item/weapon/circuitboard/smartfridge
+	category = list ("Misc. Machinery")
+
 /datum/design/monkey_recycler
 	name = "Machine Design (Monkey Recycler Board)"
 	desc = "The circuit board for a monkey recycler."
@@ -252,6 +272,16 @@
 	build_path = /obj/item/weapon/circuitboard/monkey_recycler
 	category = list ("Misc. Machinery")
 
+/datum/design/seed_extractor
+	name = "Machine Design (Seed Extractor Board)"
+	desc = "The circuit board for a seed extractor."
+	id = "seed_extractor"
+	req_tech = list("programming" = 1)
+	build_type = IMPRINTER
+	materials = list("$glass" = 1000, "sacid" = 20)
+	build_path = /obj/item/weapon/circuitboard/seed_extractor
+	category = list ("Misc. Machinery")
+
 /datum/design/processor
 	name = "Machine Design (Processor Board)"
 	desc = "The circuit board for a processor."
@@ -262,6 +292,16 @@
 	build_path = /obj/item/weapon/circuitboard/processor
 	category = list ("Misc. Machinery")
 
+/datum/design/recycler
+	name = "Machine Design (Recycler Board)"
+	desc = "The circuit board for a recycler."
+	id = "recycler"
+	req_tech = list("programming" = 1)
+	build_type = IMPRINTER
+	materials = list("$glass" = 1000, "sacid" = 20)
+	build_path = /obj/item/weapon/circuitboard/recycler
+	category = list ("Misc. Machinery")
+
 /datum/design/holopad
 	name = "Machine Design (AI Holopad Board)"
 	desc = "The circuit board for a holopad."