Implemented support for hide/show groups
Summary:
Added an option on PlacesPanel context menu to show or hide the entire
group of places.
Depends on D8855
Test Plan: Open Donlphin and use PlacesPanel context menu to hide and show groups
Reviewers: franckarrecot, mlaurent, mwolff, elvisangelaccio
Reviewed By: franckarrecot, mlaurent, mwolff, elvisangelaccio
Subscribers: rkflx, mwolff, elvisangelaccio, ngraham, Dolphin
Differential Revision: https://phabricator.kde.org/D9242