Issue #2095959 by dawehner, Berdir, InternetDevels: Remove instances of menu_get_object('node').

core/includes/menu.inc

core/includes/theme.inc

...book/lib/Drupal/book/Plugin/Block/BookNavigationBlock.php

...de/lib/Drupal/node/Plugin/views/argument_default/Node.php

...es/node/lib/Drupal/node/Tests/NodeBlockFunctionalTest.php

core/modules/node/node.module

core/modules/system/system.api.php

...lib/Drupal/taxonomy/Plugin/views/argument_default/Tid.php

...les/views/lib/Drupal/views/Plugin/views/argument/Date.php