Added ashtrays

Breakable. Spill contents on breaking or hitting the solid stuff after being thrown.
Have limited capacity. Can be emptied in disposal outlet.
Change sprite when are half-filled and filled.
Also fiddled a bit with the cigs code, so you can put them out without dropping.

code/modules/recycling/disposal.dm

@@ -61,6 +61,15 @@
 			update()
 			return
 
+		if(istype(I, /obj/item/ashtray))
+			user << "\blue You empty the ashtray."
+			for(var/obj/item/O in I.contents)
+				O.loc = src
+				I.contents -= O
+			I.icon_state = I:icon_empty
+			update()
+			return
+
 		if(istype(I, /obj/item/weapon/weldingtool) && I:welding)
 			var/obj/item/weapon/weldingtool/W = I
 			playsound(src.loc, 'Welder.ogg', 100, 1)