Reliable XMPP room connection

[ForNeVeR]

1. See the today's logs from production (I've saved them under log.txt)
2. Add a room status handler
3. See also XMPP room connection handler #18
4. When disconnected/kicked/whatever from the room, leave the whole server and reconnect

[ForNeVeR]

Blocked on #18 (I want to solve both issues with the new async XMPP client concept).

[ForNeVeR]

Fixed by #79.