Horizon mapping cleanup and bugfixes (#21450)

Fixes https://github.com/Aurorastation/Aurora.3/issues/21289
Fixes https://github.com/Aurorastation/Aurora.3/issues/15779

Handles a lot of mapping cleanup, container definitions for the Horizon,
and several bugfixes found along the way.

changes:
- code_imp: "Added set definitions for several Horizon-specific
containers."
- code_imp: "Updated 'full' material stacks on the Horizon from sneaky
var-edited singles to properly defined full stacks"
- code_imp: "Cleaned up all Air Alarms, Fire Alarms, and APCs on the
Horizon that were directional children with their dir var edited."
- code_imp: "Cleaned up all Power Cables on the Horizon that had d1 or
d2 var edited instead of just icon_state."
- code_imp: "Adjusted pixel shifts for 'south' (north-facing) Air
Alarms, Fire Alarms, APCs, and Extinguisher Cabinets to address layering
issues when standing vs. leaning."
- code_imp: "Minor refactor of shuttle/* Air Alarms and APCs to reduce
excess children; req_one_access perms now assigned based on
/area/horizon/shuttle/*."
  - qol: "Adds feedback hint for uses remaining to Emag cards."
- qol: "Added Tip about the shift-click behavior of the 'up-hint'/'Look
Up' button."
- bugfix: "See-through turfs (like lattices/catwalks over open space)
can now be Looked Up through from below."
- bugfix: "Fixed the shift-click behavior of 'up-hint'/'Look Up' button,
allowing you to see nearby turfs that can be Looked Up through."
- bugfix: "Maintenance Panels located on the floor have had their
layering issues fixed."
- bugfix: "Borg eye emissive effects MAYBE no longer visible through
higher z-levels."
- bugfix: "Added missing leanable component to window/shuttle obj type."

code/game/objects/structures/window.dm

@@ -571,6 +571,10 @@
 	layer = FULL_WINDOW_LAYER
 	rad_resistance_modifier = 4
 
+/obj/structure/window/shuttle/mouse_drop_receive(atom/dropping, mob/user, params)
+	//Adds the component only once. We do it here & not in Initialize() because there are tons of walls & we don't want to add to their init times
+	LoadComponent(/datum/component/leanable, dropping)
+
 /obj/structure/window/shuttle/legion
 	name = "reinforced cockpit window"
 	icon = 'icons/obj/smooth/shuttle_window_legion.dmi'