Create ConfigView an unmanaged ConfigWidget
Summary:
- Allow to manage controller externally
- Compatible (for checkbox) with KConfigDialogManager (usage of kcfg_ in widget name)
- Expose loader and settings in order to allow them to be managed by a KCModule
Test Plan:
- automated test
- Checked integration with Kate
- ConfigView tested with a plasma-desktop patch
Reviewers: Plasma, ervin, crossi, meven
Subscribers: kde-frameworks-devel
Tags: Frameworks
Differential Revision: https://phabricator.kde.org/D27502