fix self-inflicted 1h time-out issue; prep config gen

The 1h timeout was caused by an express setting in the icecast mount.
Other changes will make search and replace easier, thus scripting to
create the icecast configuration from a script or settings file.

icecast.xml

@@ -18,7 +18,7 @@
         <queue-size>524288</queue-size>
         <client-timeout>30</client-timeout>
         <header-timeout>15</header-timeout>
-        <source-timeout>10</source-timeout>
+        <source-timeout>17</source-timeout>
         <!-- If enabled, this will provide a burst of data when a client
              first connects, thereby significantly reducing the startup
              time for listeners that do substantial buffering. However,
@@ -34,13 +34,13 @@
 
     <authentication>
         <!-- Sources log in with username 'source' -->
-        <source-password>shredsourcepassword</source-password>
+        <source-password>$shredsourcepassword$</source-password>
         <!-- Relays log in with username 'relay' -->
-        <relay-password>shredrelaypassword</relay-password>
+        <relay-password>$shredrelaypassword$</relay-password>
 
         <!-- Admin logs in with the username given below -->
         <admin-user>admin</admin-user>
-        <admin-password>shredadminpassword</admin-password>
+        <admin-password>$shredadminpassword$</admin-password>
     </authentication>
 
     <!-- set the mountpoint for a shoutcast source to use, the default if not
@@ -134,7 +134,7 @@
         <!-- <intro>/server-wide-intro.ogg</intro> -->
         <max-listener-duration>3600</max-listener-duration>
 	<username>live</username>
-	<password>shredlivepassword</password>
+	<password>$shredlivepassword$</password>
         <authentication type="url">
                 <option name="mount_add" value="http://auth.example.org/stream_start.php"/>
         </authentication>