Fully port away from KIconThemes
Summary:
Depends on D26350
Mostly just removing unused includes
In two places replace KIconLoade::SizeSmall with QStyle equivalent
Reviewers: Plasma, davidedmundson
Reviewed By: Plasma, davidedmundson
Subscribers: apol
Maniphest Tasks: T11637
Differential Revision: https://phabricator.kde.org/D26352