[MIRROR] Fixes layering between tram bridge, pipes, and cables [MDB IGNORE] (#18590)

* Fixes layering between tram bridge, pipes, and cables (#72389)

## About The Pull Request
Fixes the cover up job of
https://github.com/tgstation/tgstation/pull/71858 throwing iron tiles
instead of the tram bridge to get ambient occlusion working.

Puts the pipes and wires on an appropriate plane and layer so they can
co-exist with the tram bridge without screwing with the tram's shading.

![tramlayers1](https://user-images.githubusercontent.com/83487515/210128789-4d57493e-5bd9-444d-bc2e-3b9c2209b47a.png)

![tramlayers2](https://user-images.githubusercontent.com/83487515/210128798-4e283498-a831-431a-b039-e1cdc751d909.png)
## Why It's Good For The Game
#71858 was a temporary fix for the bridge until a permanent solution was
found.
## Changelog
🆑 LT3
fix: Disposal pipes and cable wires now co-exist with the tram bridge
/🆑

* Fixes layering between tram bridge, pipes, and cables

Co-authored-by: lessthanthree <83487515+lessthnthree@users.noreply.github.com>

code/__DEFINES/layers.dm

@@ -111,7 +111,9 @@
 #define HIGH_TURF_LAYER 2.03
 #define TURF_PLATING_DECAL_LAYER 2.031
 #define TURF_DECAL_LAYER 2.039 //Makes turf decals appear in DM how they will look inworld.
-#define ABOVE_OPEN_TURF_LAYER 2.04
+#define DISPOSAL_PIPE_LAYER 2.04
+#define WIRE_LAYER 2.041
+#define ABOVE_OPEN_TURF_LAYER 2.042
 
 //WALL_PLANE layers
 #define CLOSED_TURF_LAYER 2.05
@@ -120,9 +122,7 @@
 #define BULLET_HOLE_LAYER 2.06
 #define ABOVE_NORMAL_TURF_LAYER 2.08
 #define LATTICE_LAYER 2.2
-#define DISPOSAL_PIPE_LAYER 2.3
 #define GAS_PIPE_HIDDEN_LAYER 2.35 //layer = initial(layer) + piping_layer / 1000 in atmospherics/update_icon() to determine order of pipe overlap
-#define WIRE_LAYER 2.4
 #define TRAM_XING_LAYER 2.41
 #define TRAM_RAIL_LAYER 2.42
 #define TRAM_FLOOR_LAYER 2.43

code/modules/power/cable.dm

@@ -17,6 +17,7 @@ GLOBAL_LIST_INIT(wire_node_generating_types, typecacheof(list(/obj/structure/gri
 	icon = 'icons/obj/power_cond/layer_cable.dmi'
 	icon_state = "l2-1-2-4-8-node"
 	color = CABLE_HEX_COLOR_YELLOW
+	plane = FLOOR_PLANE
 	layer = WIRE_LAYER //Above hidden pipes, GAS_PIPE_HIDDEN_LAYER
 	anchored = TRUE
 	obj_flags = CAN_BE_HIT

code/modules/recycling/disposal/pipe.dm

@@ -10,6 +10,7 @@
 	dir = NONE // dir will contain dominant direction for junction pipes
 	max_integrity = 200
 	armor_type = /datum/armor/structure_disposalpipe
+	plane = FLOOR_PLANE
 	layer = DISPOSAL_PIPE_LAYER // slightly lower than wires and other pipes
 	damage_deflection = 10
 	var/dpdir = NONE // bitmask of pipe directions