Issue #2323759 by Crell, dawehner: Modularize kernel exception handling.

core/core.services.yml

core/includes/menu.inc

core/lib/Drupal/Core/ContentNegotiation.php

core/lib/Drupal/Core/Controller/ExceptionController.php

.../Drupal/Core/EventSubscriber/AuthenticationSubscriber.php

...ore/EventSubscriber/CustomPageExceptionHtmlSubscriber.php

...l/Core/EventSubscriber/DefaultExceptionHtmlSubscriber.php

...rupal/Core/EventSubscriber/DefaultExceptionSubscriber.php

...b/Drupal/Core/EventSubscriber/ExceptionJsonSubscriber.php

core/lib/Drupal/Core/EventSubscriber/ExceptionListener.php

...rupal/Core/EventSubscriber/ExceptionLoggingSubscriber.php

...upal/Core/EventSubscriber/ExceptionTestSiteSubscriber.php

...l/Core/EventSubscriber/Fast404ExceptionHtmlSubscriber.php

...upal/Core/EventSubscriber/HttpExceptionSubscriberBase.php

...Drupal/Core/EventSubscriber/MaintenanceModeSubscriber.php

.../Drupal/Core/Routing/Enhancer/ParamConversionEnhancer.php

core/lib/Drupal/Core/Utility/Error.php

core/modules/shortcut/shortcut.module

core/modules/simpletest/src/WebTestBase.php

...odules/system/src/Tests/Routing/ExceptionHandlingTest.php