Merge pull request #21 from oli-obk/bugfix/xmpp_serverid_null
[Engine-XMPP] Removed jabber-net2005 and moved to agsXMPP
[Engine-XMPP] Resources and Priorities are now properly supported
[Engine-XMPP] Disable MUC until fully loaded. Open Contactchat on reconnect. Allow custom away messages. Remove outdated comments.
[Engine-XMPP] Engine doesn't crash with old frontends anymore.
[Engine-XMPP] Can now connect through a proxy