D17167: Provide a method of assigning custom default icons for non-XDG dirs

[Kai Uwe Broulik]

broulik added a reviewer: dfaure.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D17167

To: ngraham, #frameworks, cfeck, broulik, dfaure
Cc: kde-frameworks-devel, michaelh, ngraham, bruns