Adds SIGNAL_HANDLER to a bunch of procs (#6186)

* signal handler

* Remove a few that threw a shitton of errors

I'll get someone else to look at that

* we do a little async

modular_skyrat/modules/cell_component/code/cell_component.dm

@@ -135,6 +135,7 @@ component_cell_out_of_charge/component_cell_removed proc using loc where necessa
 
 /// Handling of cell removal.
 /datum/component/cell/proc/remove_cell(datum/source, mob/user)
+	SIGNAL_HANDLER
 	if(!equipment.can_interact(user))
 		return
 
@@ -161,6 +162,7 @@ component_cell_out_of_charge/component_cell_removed proc using loc where necessa
 
 /// Handling of cell insertion.
 /datum/component/cell/proc/insert_cell(datum/source, obj/item/inserting_item, mob/living/user, params)
+	SIGNAL_HANDLER
 	if(!equipment.can_interact(user))
 		return