Add endpoint to retrieve RTMP and RTMPT server list

[Juansecu]

It is necessary to add an endpoint to allow the game to retrieve RTMP and RTMPT server list.

For adding this endpoint, it is necessary to take in mind this Red5's documentation, and that the game uses the following XML structure for processing the game server list:

<?xml version="1.0" encoding="UTF-8"?>
<servers>
    <server>
        <id><!-- Numeric ID --></id>
        <urls>
            <url><!-- RTMP URL --></url>
            <url><!-- RTMPT URL --></url>
        </urls>
        <safeChat><!-- true or false --></safeChat>
        <country><!-- Country code in lower case. e.g. ar --></country>
        <name><!-- Name of the server, which will be visible by players when selecting a server after logging in the game --></name>
        <clients><!-- Max number of players connected --></clients>
    </server>
</servers>