Rework sending global notices.

Admins can now queue multiple messages and send them when they are
ready. This is fully compatible with the previous global behaviour.

Admins can now also send messages to individual servers. This is
useful for informing users of maintenance due to downtime.

data/anope.example.conf

@@ -789,7 +789,7 @@ log
  *
  *   hostserv/set            hostserv/del           hostserv/list
  *
- *   global/global
+ *   global/global         global/queue          global/server
  *
  *   operserv/news         operserv/stats        operserv/kick       operserv/exception    operserv/seen
  *   operserv/mode         operserv/session      operserv/modinfo    operserv/ignore       operserv/chanlist

data/global.example.conf

@@ -113,3 +113,29 @@ command { service = "Global"; name = "HELP"; command = "generic/help"; }
  */
 module { name = "gl_global" }
 command { service = "Global"; name = "GLOBAL"; command = "global/global"; permission = "global/global"; }
+
+/*
+ * gl_queue
+ *
+ * Provides the command global/queue.
+ *
+ * Used for queuing messages to send to every online user.
+ */
+module
+{
+	name = "gl_queue"
+
+	/* The maximum number of messages in a message queue. Defaults to 10. */
+	maxqueue = 10
+}
+command { service = "Global"; name = "QUEUE"; command = "global/queue"; permission = "global/queue"; }
+
+/*
+ * gl_server
+ *
+ * Provides the command global/server.
+ *
+ * Used for sending a message to every online user on a server.
+ */
+module { name = "gl_server" }
+command { service = "Global"; name = "SERVER"; command = "global/server"; permission = "global/server"; }