Pipe rendering rewrite

- Complete rewrite of pipe rendering code. It now selects icons from a shared cache.
- Manifolds and other devices (pumps, filters, etc.) now match the color of the connected pipes.
- Updated omni devices to use the shared cache.
- Set separate pipe color definitions.
- Cleaned up a lot of pipe code, converting it to absolute paths and removing old commented out code.
- Tweaked t-ray rendering code.
- Tweaked pipe painter.
- Enhanced pipe checking debug command.
- Expanded tank capacity and resprited them.

code/game/objects/items/devices/pipe_painter.dm

@@ -3,8 +3,15 @@
 	icon = 'icons/obj/bureaucracy.dmi'
 	icon_state = "labeler1"
 	item_state = "flight"
-	var/list/modes = list("grey","red","blue","cyan","green","yellow","purple")
-	var/mode = "grey"
+	var/list/modes
+	var/mode
+
+/obj/item/device/pipe_painter/New()
+	..()
+	modes = new()
+	for(var/C in pipe_colors)
+		modes += "[C]"
+	mode = pick(modes)
 
 /obj/item/device/pipe_painter/afterattack(atom/A, mob/user as mob)
 	if(!istype(A,/obj/machinery/atmospherics/pipe) || istype(A,/obj/machinery/atmospherics/pipe/tank) || istype(A,/obj/machinery/atmospherics/pipe/vent) || istype(A,/obj/machinery/atmospherics/pipe/simple/heat_exchanging) || istype(A,/obj/machinery/atmospherics/pipe/simple/insulated) || !in_range(user, A))
@@ -16,12 +23,10 @@
 		user << "\red You must remove the plating first."
 		return
 
-	P.pipe_color = mode
-	user.visible_message("<span class='notice'>[user] paints \the [P] [mode].</span>","<span class='notice'>You paint \the [P] [mode].</span>")
-	P.update_icon()
+	P.change_color(pipe_colors[mode])
 
 /obj/item/device/pipe_painter/attack_self(mob/user as mob)
-	mode = input("Which colour do you want to use?","Pipe painter") in modes
+	mode = input("Which colour do you want to use?", "Pipe painter", mode) in modes
 
 /obj/item/device/pipe_painter/examine()
 	..()

code/game/objects/items/devices/scanners.dm

@@ -48,11 +48,13 @@ REAGENT SCANNER
 
 			if(O.invisibility == 101)
 				O.invisibility = 0
+				O.alpha = 128
 				spawn(10)
 					if(O)
 						var/turf/U = O.loc
 						if(U.intact)
 							O.invisibility = 101
+							O.alpha = 255
 
 		var/mob/living/M = locate() in T
 		if(M && M.invisibility == 2)