Kicker backend changes for Simple Menu.
Summary:
This does three changes needed to support the Simple Menu UI:
- Support for pagination with configurable page size and related API naming changes.
- Make showing the Power / Session top-level category optional.
- Emit a signal on wheel move events in WheelInterceptor.
As well as adding inheritance from QQmlParserStatus to RootModel
to avoid startup churn.
Reviewers: Plasma, mart
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D3655