Utilize new features and make KRunner activity aware

Merged Alexander Lohnau requested to merge work/krunner_activity_aware into master

This MR embraces the new API provided by KRunner. This includes the activity aware storage of history and prior search.

Consequently the priorSearch property can be removed from the QML file and the history logic in the view.cpp file is also not needed anymore.

The config update script copies the old history to each activity.

Edited by Alexander Lohnau

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