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

[Méven Car]

meven added a reviewer: elvisangelaccio.

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

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