D8243: Implement support for categories on KfilesPlacesView

[Nathaniel Graham]

ngraham added a reviewer: VDG.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D8243

To: renatoo, #frameworks, dfaure, ervin, #vdg
Cc: ngraham, mlaurent, ervin, anthonyfieroni, cfeck, #frameworks