[Azoth] Added Kadu icon for #1352.

Taken from http://www.deviantart.com/art/Kadu-icon-for-Faenza-262669205 .
Seems like license-compatible.
[Azoth Xoox] Added Kadu IM caps. Closes #1352.
[Azoth Murm] Don't mark as online if offline, fixes #1346.