[MIRROR] Replace wall/indestructible/destructible typepath with mapping helper [MDB IGNORE] (#23735)

* Replace wall/indestructible/destructible typepath with mapping helper (#78365)

## About The Pull Request

#78239 is a fun mapping add but engineered in a way that
1. Creates a real eyesore of a typepath
2. Would further proliferate a hundred subtypes if it became commonly
used

Instead of using subtypes for this I put the behaviour in a component
and made a mapping helper to apply the component.
Now you can just put the mapping helper on top of any turf you want to
make into a zelda bomb wall and it will be so, rather than having to
make different subtypes for walls with different icons.

## Why It's Good For The Game

Cleaner, more maintainable.

## Changelog

not player facing

---------

Co-authored-by: san7890 <the@ san7890.com>

* Replace wall/indestructible/destructible typepath with mapping helper

---------

Co-authored-by: Jacquerel <hnevard@gmail.com>
Co-authored-by: san7890 <the@ san7890.com>

code/modules/mapping/mapping_helpers.dm

@@ -1359,3 +1359,19 @@ INITIALIZE_IMMEDIATE(/obj/effect/mapping_helpers/no_lava)
 
 	engraved_wall.AddComponent(/datum/component/engraved, engraving["story"], FALSE, engraving["story_value"])
 	qdel(src)
+
+/// Apply to a wall (or floor, technically) to ensure it is instantly destroyed by any explosion, even if usually invulnerable
+/obj/effect/mapping_helpers/bombable_wall
+	name = "bombable wall helper"
+	icon = 'icons/turf/overlays.dmi'
+	icon_state = "explodable"
+
+/obj/effect/mapping_helpers/bombable_wall/Initialize(mapload)
+	. = ..()
+	if(!mapload)
+		log_mapping("[src] spawned outside of mapload!")
+		return
+
+	var/turf/our_turf = get_turf(src) // In case a locker ate us or something
+	our_turf.AddElement(/datum/element/bombable_turf)
+	return INITIALIZE_HINT_QDEL