Fixes t-ray scanners and map editing (#20725)

* t-ray scanner fix

* fix map editing

* autodoc stuff

* don't hide vents and things

* misc layer fixes

code/modules/atmospherics/machinery/atmospherics.dm

@@ -23,6 +23,8 @@ Pipelines + Other Objects -> Pipe network
 
 	/// Can this be unwrenched?
 	var/can_unwrench = FALSE
+	/// Can this be put under a tile?
+	var/can_be_undertile = FALSE
 	/// If the machine is currently operating or not.
 	var/on = FALSE
 	/// The amount of pressure the machine wants to operate at.
@@ -189,7 +191,7 @@ Pipelines + Other Objects -> Pipe network
 /obj/machinery/atmospherics/attackby(obj/item/W, mob/user)
 	var/turf/T = get_turf(src)
 	if(can_unwrench && istype(W, /obj/item/wrench))
-		if(T.transparent_floor && istype(src, /obj/machinery/atmospherics/pipe) && layer != GAS_PIPE_VISIBLE_LAYER) //pipes on GAS_PIPE_VISIBLE_LAYER are above the transparent floor and should be interactable
+		if(level == 1 && T.transparent_floor && istype(src, /obj/machinery/atmospherics/pipe))
 			to_chat(user, "<span class='danger'>You can't interact with something that's under the floor!</span>")
 			return
 		if(level == 1 && isturf(T) && T.intact)
@@ -278,11 +280,10 @@ Pipelines + Other Objects -> Pipe network
 	initialize_directions = P
 	var/turf/T = loc
 	if(!T.transparent_floor)
-		level = T.intact ? 2 : 1
+		level = (T.intact || !can_be_undertile) ? 2 : 1
 	else
 		level = 2
-		plane = GAME_PLANE
-		layer = GAS_PIPE_VISIBLE_LAYER
+	update_icon_state()
 	add_fingerprint(usr)
 	if(!SSair.initialized) //If there's no atmos subsystem, we can't really initialize pipenets
 		SSair.machinery_to_construct.Add(src)

code/modules/atmospherics/machinery/pipes/pipe.dm

@@ -8,6 +8,8 @@
 	damage_deflection = 12
 	var/alert_pressure = 80*ONE_ATMOSPHERE //minimum pressure before check_pressure(...) should be called
 
+	can_be_undertile = TRUE
+
 	//Buckling
 	can_buckle = TRUE
 	buckle_requires_restraints = TRUE