Currently only contains a relation generator.
Removed relation_ui.module.

Rename and merge all Relation UI code into parent Relation module.
relation_ui.module still exists, which contains some code to generate relations for testing. This has yet to be migrated to Drupal 8.

Change endpoint listing on relation content page to a list render element.

Change permission descriptions to clarify that Relation CRUD is for all relations.

Fix relation_query_enforce_distinct_endpoints_alter where a #conjunction key is found in the conditions list.
Fix incorrect delete form for Relation entity.
Fix distinct relation exists helper where arity > 2
Fixed writing to a endpoint test variable. Now duplicating former endpoint instead of modifying.

Re-define all dependencies in base test class. (experimental temporary measure to trigger d.o testbot)
Change how enforce_distinct_endpoints query tag acquires table name for relation field data.

Changed permissions of logged in user on a per-test basis.

maybe todo: test if field data was deleted. Although this should be tested by the API. Not UI submodule. Use test from CrudTest::testDeleteField when it has a test. Currently has 'TODO: Also test deletion of the data stored in the field ?'
Add invokation of entity_invoke_bundle_hook(), and cache invalidations on relation bundle change.
Fix not being able to add/change relation type label.

Prevents drupal.org testbot from testing these files.

Disabled tests which are not working.
Fixed RelationTestBase
Fixed testRelationTypes() test.
Fixed testRelationSave() test.
Fixed testRelationDelete() test.
Deleted old relation rules tests.

Fixed endpoints() method on Relation entity.
Fixed relation_get_related_entity()

Add routing and menu item for edit form.
Entity manager includes a default canonical link for relations. ensure new canonical link, and others, overwrite any pre-existing.
Implement a fake langcode property for relations, otherwise the edit form will not save.

Fixed endpoint table relation field formatter.
Fixed endpoint entity render relation field formatter.
Removed _relation_endpoint_get_endpoint_entity_types(). It is no longer used.
RelationUIController now renders relation entities.
Modified language on relation type delete confirmation form.
Added relation template.
Added back some hook_menu entries.
Implemented additional theme hooks.
Fixed controllers for 'relation' entity pointing to 'relation type' entity controllers.
Added relation view and delete routes.
Fixed some PHPdoc pointing to old namespaces.
Added relation delete confirm controller.

Relation type form controllers moved to relation ui module. List controller and delete confirm form added for relation types.

Relation field is now created on demand, instead of install.
Add baseFieldDefinitions to Relation entity.

Cannot define route_base_path in entity annotation because it requires
relation UI to be installed. If route_base_path is defined and 
Relation UI is not enabled, admin/structure will throw exceptions.

Issue #1990880

Removed Relation::endpoints_load()
Added Relation::endpoints()

Relocate relation.views.inc
Cleaned up terminology in relation.views.inc. Left is now source, Right is now target.