/Icon/ Folder cleansing crusade part, I think 4; post-wallening clean-up. (#85823)

Hello everybuddy, your number three rated coder-failure here to clean up
some mess. This PR accomplishes some of the more major structural clean
up changes I wanted to do with /obj/ folder, but decided to wait on
until wallening gets merged, and so, time has come. Several things to
still be done, although I know these cleaning PR's are quite a load, so
will wait for this one to get done with first.

## Why It's Good For The Game
Saner spriters, better sprites, less annoyance. Also deleted a whole
load of redundancy this time around, a lot of sprites which existed
simultaniously in two places now got exit their quantum superposition.

code/modules/mapfluff/ruins/spaceruin_code/hilbertshotel.dm

@@ -4,7 +4,7 @@ GLOBAL_VAR_INIT(hhMysteryRoomNumber, rand(1, 999999))
 /obj/item/hilbertshotel
 	name = "Hilbert's Hotel"
 	desc = "A sphere of what appears to be an intricate network of bluespace. Observing it in detail seems to give you a headache as you try to comprehend the infinite amount of infinitesimally distinct points on its surface."
-	icon = 'icons/obj/structures.dmi'
+	icon = 'icons/obj/fluff/general.dmi'
 	icon_state = "hilbertshotel"
 	w_class = WEIGHT_CLASS_SMALL
 	resistance_flags = INDESTRUCTIBLE | LAVA_PROOF | FIRE_PROOF | UNACIDABLE | ACID_PROOF

code/modules/mapfluff/ruins/spaceruin_code/meatderelict.dm

@@ -89,7 +89,7 @@
 /obj/structure/puzzle_blockade/meat
 	name = "mass of meat and teeth"
 	desc = "A horrible mass of meat and teeth. Can it see you? You hope not. Virtually indestructible, must be a way around."
-	icon = 'icons/obj/structures.dmi'
+	icon = 'icons/obj/structures/tall.dmi'
 	icon_state = "meatblockade"
 	opacity = TRUE