Issue #2332049 by Wim Leers: Silliest, most trivial clean-up of drupal_render() EVER.
Revert "Issue #2154775 by er.pushpinderrana, barnettech, kirkkala, InternetDevels | Wim Leers: Fixed In-place editing of title: works, but cursor is invisible."

This reverts commit 3973634d148c706937ff8b5f9a518aaed823aa65.
Issue #2330465 by rachel_norfolk: Fixed Remove entity_reference.admin.css.
Issue #2074203 by cilefen, Wim Leers, Gábor Hojtsy: Add changed time tracking to menu links.
Issue #2320037 by Gábor Hojtsy: Fixed Non-fieldable entities (with only base fields) cannot be configured translatable, eg. shortcuts.
Issue #2329765 by tim.plunkett | sun: Remove all @backup* annotations from (pure) unit tests.
Issue #2332299 by dawehner: Fixed Strict failures in TestRunnerKernel.
Issue #2303673 by dawehner, damiankloip, effulgentsia, Fabianx: Implement stackphp; cleanup handlePageCache() and preHandle()
Issue #2323721 follow-up by David_Rothstein: Restore missing test.
Copy the Composer files to the core directory.