SA-CORE-2017-001 by alexpott, benjy, Berdir, casey, cilefen, dawehner, Heine, klausi, larowlan, Mixologic, mlhess, pwolanin, samuel.mortenson, Wim Leers, xjm, YesCT

Issue #2156661 by Jalandhar, jsbalsera, ianthomas_uk, sidharthap, jhodgdon: Search admin menu entry uses "settings" -- UI-text standards violation.

Issue #2042807 by tim.plunkett, pwolanin, ianthomas_uk, jhodgdon: Convert search plugins to use a ConfigEntity and a PluginBag.

Issue #1987806 by kim.pepper, disasm, vijaycs85, tim.plunkett: Convert search_view() to a new style controller.

Issue #2063401 by dawehner, damiankloip, tim.plunkett: Replace the default _access_checks()(access mode) with ALL instead of ANY.

Issue #2089635 by tim.plunkett, disasm, larowlan: Convert non-test non-form page callbacks to routes and controllers.

Issue #2051097 by dawehner, Manuel Garcia, tlattimore, neclimdul: Change 'pattern' to 'path' in *.routing.yml files.

Issue #1981368 by tim.plunkett, Crell, webchick: Convert all routes to 'module_name().foo_bar()' naming convention.

Issue #1933518 by ACF, pwolanin, mparker17: Convert search's system_config_form() to SystemConfigFormBase.