OOC Notifications

- - -
Both joining and posting to OOC now have accompanying audio.
Additionally, joining presents everyone with a message that you've connected. An example will be provided with the PR.

code/modules/client/verbs/ooc.dm

@@ -66,6 +66,10 @@ GLOBAL_VAR_INIT(normal_ooc_colour, "#002eb8")
 	//The linkify span classes and linkify=TRUE below make ooc text get clickable chat href links if you pass in something resembling a url
 	for(var/client/C in GLOB.clients)
 		if(C.prefs.chat_toggles & CHAT_OOC)
+
+			if(C.prefs.toggles)
+				C << sound('hyperstation/sound/effects/oocalert.ogg')
+
 			if(holder)
 				if(!holder.fakekey || C.holder)
 					if(check_rights_for(src, R_ADMIN))