D27180: Add sortable columns to session manager dialog, and remove previous sorting code

[Raphael Rosch]

rrosch added a comment.


  F8089047: kate-sort-session.png <https://phabricator.kde.org/F8089047>
  
  As requested. You will notice that the button to sort has been removed and sorting is done only by clicking the header bars.

REPOSITORY
  R40 Kate

REVISION DETAIL
  https://phabricator.kde.org/D27180

To: rrosch, #kate, dhaumann, cullmann
Cc: kwrite-devel, rrosch, domson, michaelh, ngraham, demsking, cullmann, sars, dhaumann
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