Update for #2260121.
Update test class namespaces in mocks thanks to #2260121.
Update for context changes in #2293205.
Issue #2323927 by dsnopek | dawehner: Rename page_manager.menu_links.yml -> page_manager.links.menu.yml.
Update for $form_state improvements.
FormState no longer has a constructor.
Issue #2340931 by Berdir: Access control and _page to page_manager_page rename.
Issue #2287733 by Berdir, tim.plunkett: Added Configure page title per display.