Made several improvements to flashlights (#16050)

* Made several improvements to flashlights, and added a sprite for device cells

* CL

* Added lathe recipes, and made eCigs use device power cells

* Add another entry to CL

* Fix nested cell

* Added `desc_info` to all flashlights, to teach the player about removing the cells and turning them on.

* Update code/game/objects/items/devices/lighting/lamp.dm

* More cleanup

* Allow Flashlights to use rechargers

* Apply suggestions from code review

Co-authored-by: Fluffy <65877598+FluffyGhoster@users.noreply.github.com>

* Update flare.dm

* Update flashlight.dm

Fix broken code review suggestion

* Update flare.dm

Ditto

---------

Co-authored-by: Fluffy <65877598+FluffyGhoster@users.noreply.github.com>

code/modules/power/cell.dm

@@ -29,16 +29,18 @@
 
 /obj/item/cell/update_icon()
 	cut_overlays()
-
-	if(charge < 0.01)
-		return
-	else if(charge/maxcharge >=0.995)
-		add_overlay("cell-o2")
-	else
-		add_overlay("cell-o1")
+	switch(percent())
+		if(95 to 100)
+			add_overlay("cell-o2")
+		if(25 to 94)
+			add_overlay("cell-o1")
+		if(0.05 to 25)
+			add_overlay("cell-o0")
+		if(0 to 0.05)
+			return
 
 /obj/item/cell/proc/percent()		// return % charge of cell
-	return 100.0*charge/maxcharge
+	return maxcharge && (100.0*charge/maxcharge)
 
 /obj/item/cell/proc/fully_charged()
 	return (charge == maxcharge)