Issue #2384009 by arpitr: Remove deprecated function _update_create_fetch_task and its usage
Issue #2384581 by cilefen, Wim Leers: Security: Update CKEditor library to 4.4.6
Issue #2369781 by larowlan: Ensure twig_debug output has needed sanitization
Issue #2342593 by znerol, grendzy, David_Rothstein: Remove mixed SSL support from core
Issue #2377685 by LewisNyman, herom: Fix outdated CSS rules in Views UI
Issue #2383727 by a_thakur: Remove form_options_flatten() as it is deprecated
Issue #2383307 by alexpott: Remove weird getInfo methods from fake database classes