Check for plugins using newer atcore method
Summary: Sync our plugin detection method to atcores
Reviewers: laysrodrigues, patrickelectric, tcanabrava, leandrosantiago
Reviewed By: laysrodrigues, patrickelectric
Subscribers: Atelier: General Development
Tags: Atelier: General Development
Differential Revision: https://phabricator.kde.org/D14981