Randoms Part 1 and also Corn - Random object sprites and corn tank changes. (#19975)

Added new sprites for random objects for everything in random/clothing,
/food, /loot, /medical, and /misc.
Also got distracted and changed how the corn oil/cooking oil tank looks
and how much reagent it holds. Now looks like the rest of the reagent
tanks and holds the same amount of liquid, 1000u.

code/game/objects/random/tech.dm

@@ -1,7 +1,6 @@
 /obj/random/tool
 	name = "random tool"
 	desc = "This is a random tool"
-	icon = 'icons/obj/random.dmi'
 	icon_state = "tool"
 	spawnlist = list(
 		/obj/item/screwdriver,
@@ -27,7 +26,6 @@
 /obj/random/powercell
 	name = "random powercell"
 	desc = "This is a random powercell."
-	icon = 'icons/obj/random.dmi'
 	icon_state = "cell"
 	problist = list(
 		/obj/item/cell = 40,
@@ -55,7 +53,6 @@
 /obj/random/toolbox
 	name = "random toolbox"
 	desc = "This is a random toolbox."
-	icon = 'icons/obj/random.dmi'
 	icon_state = "toolbox"
 	spawnlist = list(
 		/obj/item/storage/toolbox/mechanical = 3,
@@ -66,7 +63,6 @@
 /obj/random/tech_supply
 	name = "random tech supply"
 	desc = "This is a random piece of technology supplies."
-	icon = 'icons/obj/random.dmi'
 	icon_state = "tech_supply"
 	problist = list(
 		/obj/random/powercell = 3,