Cleans up update_icons, makes the update_icon_updates_onmob element bespoke, updates CODEOWNERS (#69179)

* I just realised this is all one commit.

* hail marry

* fix.

* FIXES IT FOR REAL

* Update code/datums/elements/update_icon_updates_onmob.dm

code/datums/components/bloodysoles.dm

@@ -272,7 +272,7 @@
 			human.overlays_standing[SHOES_LAYER] = bloody_feet
 			human.apply_overlay(SHOES_LAYER)
 		else
-			human.update_inv_shoes()
+			human.update_worn_shoes()
 
 /datum/component/bloodysoles/feet/add_parent_to_footprint(obj/effect/decal/cleanable/blood/footprints/FP)
 	if(!ishuman(wielder))

code/datums/components/twohanded.dm

@@ -244,9 +244,9 @@
 
 	if(istype(user)) // tk showed that we might not have a mob here
 		if(user.get_item_by_slot(ITEM_SLOT_BACK) == parent)
-			user.update_inv_back()
+			user.update_worn_back()
 		else
-			user.update_inv_hands()
+			user.update_held_items()
 
 		// if the item requires two handed drop the item on unwield
 		if(require_twohands && can_drop)