Revert "Issue #1559244 by Xano, jhodgdon: Clean up search settings page."

This change was a bit more than we bargained for and caused critical tasks
to have to re-roll. Rolling back for now so we can discuss it more.

This reverts commit 541f24c2cca5536b3421a635d2de3d706b7e94ce.
Issue #2154683 by Gábor Hojtsy: Ul.links has no active styling for links (language switcher active link is indistinguishable).
Issue #1973522 by vijaycs85, chr.fritsch, piyuesh23: Provide config schema to field types and storage in file module.
Issue #1973436 by claudiu.cristea, vijaycs85: Provide config schema to field types storage for image module.
Issue #2152581 by swentel: 'Manage fields' screen needs mobile-izing.
Issue #1938390 by andypost, disasm, jibran, dawehner, ygerasimov, pfrenssen: Convert contact_site_page and contact_person_page to a new-style Controller.
Issue #2031725 by fgm, fago, vladan.me, Nebel54, Berdir: Move all entity display interfaces to the core component.
Issue #2151427 by andypost, TR: Convert COMMENT_NOT_PUBLISHED & COMMENT_PUBLISHED to a constant on the comment interface.
Issue #1938062 by dawehner, tstoeckler, slashrsm, tim.plunkett, olli, pcambra, YesCT, damiankloip: Convert the recent_comments block to a view.
Issue #2148071 by Gábor Hojtsy, philipz, marthinal, penyaskito: Cannot install in foreign language (Undefined index: und in ContentEntityBase->language()).
Issue #2105927 by a_thakur, vijaycs85: Complete config of Contact module.
Issue #2091377 by batigolix, jhodgdon: Change link format in hook_help in Text Editor module.
Issue #2055937 by Wim Leers, jessebeach: Introduce error handling to in-place editing; if an AJAX request to commit changes fails, the user cannot recover.
Issue #2105933 by dsdeiz, a_thakur: Make sure all YML files in Dblog Translation module has no type-casting to string.
Issue #1977998 by Bojhan, areke: Clean up Administrative name and description.
Issue #1938062 followup by andypost: Convert the recent_comments block to a view.
Issue #2149877 by amateescu, swentel: The 'filesize' base field of field entities is a boolean?.
Issue #2095335 by Wim Leers, vijaycs85: Remove drupal_add_css() and drupal_add_js() from the ajax system.
Issue #2136641 by damiankloip: Remove boolean usage of ajax property in Views UI link operation building.
Issue #1790298 by nagba, pwolanin: Unindexed query in aggregator module.