Port to categorized logging most of ksirk

Not ported:
- the Jabber directory; a separate category will be used, to minimize
  the change with the original version from Kopete;
- the ksirk/iris directory, to minimize the diversion; those files use
  qDebug anyway, not kDebug.
- bump the version of ECM to match the Frameworks one, which would make
  sense in itself, but also to have get a version which provides
  the ecm_qt_declare_logging_category macro.