Issue #2958429 by alexpott: Properly deprecate SafeMarkup::format()

core/includes/bootstrap.inc

core/includes/common.inc

core/includes/errors.inc

core/includes/menu.inc

core/includes/tablesort.inc

core/lib/Drupal/Component/Gettext/PoStreamReader.php

core/lib/Drupal/Component/Utility/SafeMarkup.php

...ib/Drupal/Core/Config/Development/ConfigSchemaChecker.php

core/lib/Drupal/Core/Config/PreExistingConfigException.php

core/lib/Drupal/Core/Entity/ContentEntityBase.php

.../Drupal/Core/EventSubscriber/FinalExceptionSubscriber.php

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

...eld/Plugin/Field/FieldFormatter/TimestampAgoFormatter.php

...Drupal/Core/ImageToolkit/ImageToolkitOperationManager.php

core/lib/Drupal/Core/Logger/LogMessageParser.php

core/lib/Drupal/Core/Logger/LogMessageParserInterface.php

core/lib/Drupal/Core/Menu/menu.api.php

core/lib/Drupal/Core/Render/Element.php

...rupal/Core/StringTranslation/PluralTranslatableMarkup.php

...ib/Drupal/Core/StringTranslation/TranslationInterface.php