Issue #2121713 by tim.plunkett, dawehner, rteijeiro, jiv_e: Move drupal_html_id() and drupal_html_class() to Drupal\Component\Utility.
Issue #2328061 by tim.plunkett: Move datetime's FormElement #type classes in Core.
Issue #2329429 by dawehner: Fixed Permission page order is all wackadoo.