/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/mob/living/basic/lavaland/node_drone/node_drone.dm

@@ -13,7 +13,7 @@
 	SET_BASE_VISUAL_PIXEL(0, 6)
 	name = "NODE drone"
 	desc = "Standard in-atmosphere drone, used by Nanotrasen to operate and excavate valuable ore vents."
-	icon = 'icons/obj/mining.dmi'
+	icon = 'icons/obj/mining_zones/equipment.dmi'
 	icon_state = "mining_node_active"
 	icon_living = "mining_node_active"
 	icon_dead = "mining_node_active"