Kitchen Overhaul

MASSIVE overhaul to the kitchen, should make the chef job more
interesting.

Additions:
- Candy Maker!
- - This machine allows the chef to create a variety of sugary treats
for the crew to enjoy.
- Candy! Lots of candy and this is only the first wave!
- - More candy planned / dreamed for the future
- Candy Moulds
- - Craftable from plastic sheets, also available in the kitchen vendor.
Use these to make different candy types
- - These are returned if you successfully make the candy. Screw up and
the mould is destroyed!
- Cardboard Tubes are now craftable from cardboard

Changes:
- Oven and Grill have been updated to work more in line with the
Microwave and Candy Maker.
- - This means that they are also buildable and upgradeable!
- - Boards for the oven, grill, and candy maker are available from the
circuit printer.
- Many recipes moved from the microwave to the oven and grill.
- - For example, bread is made in the oven, and kabobs are made on the
grill.
- Adds "byproduct" var to recipes
- - Allows for the return of an item in addition to the result,
currently used for candy moulds

Fixes
- Adds Grape Juice reagent.
- - This will fix a runtime and also allow people to actually drink from
the purple cans.

Sprite Credits
- Many thanks to FoS for their sprites for a lot of the candies which I
combined and recolored
- - Also thanks for the new sprites which were included, but not all
used (yet!)
- I also edited and created some horrible sprites for a few candy items
and machine states.
- - Hopefully they will be such an eyesore that a real spriter steps up
and provides something nice.

This overhaul should hopefully add a little variety to the chef role,
while keeping it largely unchanged in terms of difficulty.

code/datums/recipe.dm

@@ -38,6 +38,7 @@
 	var/list/items // example: =list(/obj/item/weapon/crowbar, /obj/item/weapon/welder) // place /foo/bar before /foo
 	var/result //example: = /obj/item/weapon/reagent_containers/food/snacks/donut/normal
 	var/time = 100 // 1/10 part of second
+	var/byproduct	//example: = /obj/item/weapon/kitchen/mould		// byproduct to return, such as a mould or trash
 
 
 /datum/recipe/proc/check_reagents(var/datum/reagents/avail_reagents) //1=precisely, 0=insufficiently, -1=superfluous
@@ -118,3 +119,9 @@
 				i_count = N_i
 				. = recipe
 		return .
+
+/datum/recipe/proc/get_byproduct()
+	if(byproduct)
+		return byproduct
+	else
+		return null