Add "SkipSwitcher" to API

Summary:
Adding "SkipSwitcher" to API, stemming from discussion in
BUG 375921. Please see following comments for important information.

Depends on / related to D11925 and D11926.

Reviewers: hein, graesslin

Reviewed By: graesslin

Subscribers: ngraham, graesslin, apol, Frameworks

Tags: Frameworks

Differential Revision: https://phabricator.kde.org/D11924