Adds 'Intercom Convo' verb

Allows an admin to 'schedule' up to 20 messages to play on the radio.

code/modules/admin/admin_verbs.dm

@@ -26,6 +26,7 @@ var/list/admin_verbs_admin = list(
 	/datum/admins/proc/toggleguests,	//toggles whether guests can join the current game,
 	/datum/admins/proc/announce,		//priority announce something to all clients.,
 	/datum/admins/proc/intercom,		//send a fake intercom message, like an arrivals announcement,
+	/datum/admins/proc/intercom_convo,	//send a fake intercom conversation, like an ATC exchange,
 	/client/proc/colorooc,				//allows us to set a custom colour for everythign we say in ooc,
 	/client/proc/admin_ghost,			//allows us to ghost/reenter body at will,
 	/client/proc/toggle_view_range,		//changes how far we can see,