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/datums/tips/tips.dm

@@ -57,7 +57,8 @@ GLOBAL_LIST_EMPTY(tips_by_category)
 		"Role-playing isn't easy, the wiki contains resources to help.",
 		"Trash piles are bounties of interesting loot, but you can also hide in them, just drag your sprite onto the pile.",
 		"Switching to another weapon is always faster than reloading.",
-		"Remember to turn off your VPN before you try and connect."
+		"Remember to turn off your VPN before you try and connect.",
+		"You can shift-click the 'up-hint' button (that shows you whether or not the turf above you can be Looked Up through) to see ALL nearby turfs that you can Look Up through."
 	)
 
 /*

code/datums/uplink/devices_and_tools.dm

@@ -74,6 +74,7 @@
 	telecrystal_cost = 1
 	bluecrystal_cost = 1
 	path = /obj/item/card/emag
+	desc = "It's a card that can be used to override, booby-trap, manipulate, take over, and otherwise do nefarious things to a wide variety of objects. Has ten uses."
 
 /datum/uplink_item/item/tools/personal_shield
 	name = "Personal Shield"