Issue #1957142 by damiankloip, fubhy, cosmicdreams: Replace config() with Drupal::config().

core/includes/ajax.inc

core/includes/authorize.inc

core/includes/bootstrap.inc

core/includes/common.inc

core/includes/config.inc

core/includes/entity.api.php

core/includes/file.inc

core/includes/form.inc

core/includes/install.core.inc

core/includes/install.inc

core/includes/language.inc

core/includes/mail.inc

core/includes/menu.inc

core/includes/module.inc

core/includes/path.inc

core/includes/theme.inc

core/includes/update.inc

core/lib/Drupal.php

core/lib/Drupal/Core/Asset/AssetDumper.php

core/lib/Drupal/Core/Config/Context/ContextInterface.php