Small storage refactor and examine change (#44109)

* Removes repeated line

* Description change for clothing items that can only store specific items

* Get all children of can_hold listed items.

* can_hold only needs the top most item, child items are dealt automatically

* cant_hold related change

* Text change

* Moves the item check to the line above, and removes the current.

* Same changes, but to belt/wallet code.

* Change to using signals instead

* Generic signal on datum/topic

* Cache typecache, and small signal change

* Small argument tweaks and remove unneeded lists

* Change to proc

* Change call can_holds/cant_holds to use new proc

* initial, and cleaned up display code

* Null check

code/modules/mob/living/carbon/human/human_defense.dm

@@ -674,8 +674,6 @@
 				to_chat(src, "<span class='notice'>You succesfuly remove the durathread strand.</span>")
 				remove_status_effect(STATUS_EFFECT_CHOKINGSTRAND)
 			return
-		visible_message("[src] examines [p_them()]self.", \
-			"<span class='notice'>You check yourself for injuries.</span>")
 		check_self_for_injuries()