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/game/objects/effects/decals/Cleanable/fuel.dm

@@ -2,7 +2,7 @@
 	//Liquid fuel is used for things that used to rely on volatile fuels or plasma being contained to a couple tiles.
 	icon = 'icons/effects/effects.dmi'
 	icon_state = "fuel"
-	layer = LATTICE_LAYER
+	layer = ABOVE_NORMAL_TURF_LAYER
 	var/amount = 1 //Basically moles.
 
 /obj/effect/decal/cleanable/liquid_fuel/Initialize(mapload, amt = 1)

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

@@ -57,6 +57,9 @@ REAGENT SCANNER
 			var/mutable_appearance/MA = new(O)
 			MA.alpha = 128
 			MA.dir = O.dir
+			if(MA.layer < TURF_LAYER)
+				MA.layer += TRAY_SCAN_LAYER_OFFSET
+			MA.plane = GAME_PLANE
 			I.appearance = MA
 			t_ray_images += I
 	if(length(t_ray_images))

code/game/objects/structures/aliens.dm

@@ -242,7 +242,7 @@
 	icon_state = "weeds"
 	base_icon_state = "weeds"
 	max_integrity = 15
-	layer = WIRE_TERMINAL_LAYER
+	layer = ABOVE_ICYOVERLAY_LAYER
 	smoothing_flags = SMOOTH_BITMASK
 	smoothing_groups = list(SMOOTH_GROUP_ALIEN_RESIN, SMOOTH_GROUP_ALIEN_WEEDS)
 	canSmoothWith = list(SMOOTH_GROUP_ALIEN_WEEDS, SMOOTH_GROUP_WALLS)