Verbs subsystem (#20333)

What it says on the can; now we can better compensate for processing
spikes by queueing and accounting for verb times (assuming we actually
use this framework to invoke the bulk of them). I have added its use to
some of them, more can be ported as time goes on, eventually everything
but the most trivial ones should go through this.

No player facing changes. Hopefully.

Praise be the omnissiah.

code/modules/client/client_procs.dm

@@ -25,7 +25,8 @@ var/list/localhost_addresses = list(
 	If you have any  questions about this stuff feel free to ask. ~Carn
 	*/
 
-/client/Topic(href, href_list, hsrc)
+//the undocumented 4th argument is for ?[0x\ref] style topic links. hsrc is set to the reference and anything after the ] gets put into hsrc_command
+/client/Topic(href, href_list, hsrc, hsrc_command)
 	if(!usr || usr != mob)	//stops us calling Topic for somebody else's client. Also helps prevent usr=null
 		return
 
@@ -257,8 +258,17 @@ var/list/localhost_addresses = list(
 		if(QDELETED(real_src))
 			return
 
+	//fun fact: Topic() acts like a verb and is executed at the end of the tick like other verbs. So we have to queue it if the server is
+	//overloaded
+	if(hsrc && hsrc != holder && DEFAULT_TRY_QUEUE_VERB(VERB_CALLBACK(src, PROC_REF(_Topic), hsrc, href, href_list)))
+		return
 	..()	//redirect to hsrc.Topic()
 
+///dumb workaround because byond doesnt seem to recognize the Topic() typepath for /datum/proc/Topic() from the client Topic,
+///so we cant queue it without this
+/client/proc/_Topic(datum/hsrc, href, list/href_list)
+	return hsrc.Topic(href, href_list)
+
 /proc/client_by_ckey(ckey)
 	return GLOB.directory[ckey]