Arranges lots of things into planes (#5072)

* Rearranges a billion things into planes

* Make cryotubes fancy

* Update Travis

* Fix hiding logic

code/ATMOSPHERICS/atmospherics.dm

@@ -17,7 +17,8 @@ Pipelines + Other Objects -> Pipe network
 	var/nodealert = 0
 	var/power_rating //the maximum amount of power the machine can use to do work, affects how powerful the machine is, in Watts
 
-	layer = 2.4 //under wires with their 2.44
+	layer = PIPES_LAYER
+	plane = PLATING_PLANE
 
 	var/connect_types = CONNECT_TYPE_REGULAR
 	var/icon_connect_type = "" //"-supply" or "-scrubbers"

code/ATMOSPHERICS/components/unary/outlet_injector.dm

@@ -5,7 +5,6 @@
 /obj/machinery/atmospherics/unary/outlet_injector
 	icon = 'icons/atmos/injector.dmi'
 	icon_state = "map_injector"
-	layer = 3
 
 	name = "air injector"
 	desc = "Passively injects air into its surroundings. Has a valve attached to it that can control flow rate."

code/ATMOSPHERICS/mainspipe.dm

@@ -34,7 +34,8 @@ obj/machinery/atmospherics/pipe/mains_component
 
 obj/machinery/atmospherics/mains_pipe
 	icon = 'icons/obj/atmospherics/mainspipe.dmi'
-	layer = 2.4 //under wires with their 2.5
+	layer = PIPES_LAYER
+	plane = PLATING_PLANE
 
 	var/volume = 0
 

code/ATMOSPHERICS/pipes/cap.dm

@@ -7,7 +7,6 @@
 	icon = 'icons/atmos/pipes.dmi'
 	icon_state = ""
 	level = 2
-	layer = 2.4 //under wires with their 2.44
 
 	volume = 35