Migrate config from KConfig to KConfigXt in order to allow KCM to use it
Reviewers: ervin, crossi, meven, Plasma, bruns
Reviewed By: ervin
Subscribers: meven, crossi, ervin, kde-frameworks-devel, Baloo, Plasma
Tags: Frameworks, Baloo
Differential Revision: https://phabricator.kde.org/D26400