Issue #1918768 by larowlan, tim.plunkett: Refactor tour module to use routes instead of paths.

...modules/system/config/schema/system.data_types.schema.yml

core/modules/tour/config/schema/tour.schema.yml

core/modules/tour/lib/Drupal/tour/Entity/Tour.php

core/modules/tour/lib/Drupal/tour/Tests/TourTest.php

core/modules/tour/lib/Drupal/tour/TourInterface.php

.../modules/tour/tests/Drupal/tour/Tests/Entity/TourTest.php

...les/tour/tests/tour_test/config/tour.tour.tour-test-2.yml

...dules/tour/tests/tour_test/config/tour.tour.tour-test.yml

...st/lib/Drupal/tour_test/Controller/TourTestController.php

core/modules/tour/tests/tour_test/tour_test.routing.yml

core/modules/tour/tour.module

core/modules/views_ui/config/tour.tour.views-ui.yml