[Engine-XMPP] Engine doesn't crash with old frontends anymore.
[Engine-XMPP] make sure monodevelop compiles agsxmpp together with everything else
[Engine-XMPP] Can now connect through a proxy
[Engine-XMPP] Prevent xmpp from crashing when connecting to unsaved servers or from old frontends
[Engine] ServerModel sends and receives ServerID in a backwards compatible way