[Cuttlefish] Compare an icon in different themes
Summary: The icon in different installed themes is shown in an overlay sheet.
Test Plan:
Reviewers: Plasma, VDG, ngraham
Reviewed By: VDG, ngraham
Subscribers: ngraham, filipf, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D24305