D25741: Add natural sorting and case-insensitive sorting for all role-types

[George Vogiatzis]

gvgeo marked 2 inline comments as done.

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D25741

To: gvgeo, #dolphin, nicolasfella, meven, elvisangelaccio, ngraham
Cc: cfeck, meven, kfm-devel, pberestov, iasensio, fprice, MrPepe, fbampaloukas, alexde, Codezela, feverfew, spoorun, navarromorales, firef, ngraham, andrebarros, emmanuelp, mikesomov
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