CC-2607: Abilitiy to adjust stream bitrate, type, etc from the UI

interface

- dummy page "Stream Setting" page for the test
- StreamSetting model is added
- set owner and group as 'pypo' for liquidsoap.cfg
- pypofech handle 'update_stream_setting' command

airtime_mvc/application/models/RabbitMq.php

@@ -57,7 +57,7 @@ class RabbitMq
         $channel = $conn->channel();
         $channel->access_request($CC_CONFIG["rabbitmq"]["vhost"], false, false, true, true);
 
-        $EXCHANGE = 'airtime-schedule';
+        $EXCHANGE = 'airtime-pypo';
         $channel->exchange_declare($EXCHANGE, 'direct', false, true);
 
         $data = json_encode($md);