Issue #2282161 by Crell: Split off link/url generation trait.

core/lib/Drupal/Core/Breadcrumb/BreadcrumbBuilderBase.php

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

core/lib/Drupal/Core/Form/FormBase.php

core/lib/Drupal/Core/Routing/LinkGeneratorTrait.php

core/lib/Drupal/Core/Routing/UrlGeneratorTrait.php

...odules/aggregator/src/Controller/AggregatorController.php

core/modules/comment/src/Controller/CommentController.php

core/modules/contact/src/Controller/ContactController.php

core/modules/locale/src/Controller/LocaleController.php

core/modules/shortcut/src/Form/SetCustomize.php

core/modules/system/src/Form/ModulesListConfirmForm.php

core/modules/user/src/Form/UserMultipleCancelConfirm.php