Implements UIDs and initial topic integration

code/modules/client/client procs.dm

@@ -29,6 +29,15 @@
 	if(!usr || usr != mob)	//stops us calling Topic for somebody else's client. Also helps prevent usr=null
 		return
 
+	// src should always be a UID; if it isn't, warn instead of failing entirely
+	if(href_list["src"])
+		hsrc = locateUID(href_list["src"])
+		if(!hsrc)
+			hsrc = locate(href_list["src"])
+			if(hsrc)
+				var/hsrc_info = datum_info_line(hsrc) || "[hsrc]"
+				log_runtime(EXCEPTION("Got \\ref-based src in topic from [src] for [hsrc_info], should be UID: [href]"))
+
 	#if defined(TOPIC_DEBUGGING)
 	to_chat(world, "[src]'s Topic: [href] destined for [hsrc].")
 	#endif