* EXreaction/ticket/11415:
[ticket/11415] Add test for find_from_extension()
[ticket/11415] Send the extension base the finder rather than the manager
[ticket/11415] Create function in finder find_from_extension
[ticket/11415] Fix ext.manager constructor in tests
[ticket/11415] Make migrator/ext.manager dependencies of the base ext class
[ticket/11415] Remove migrator dependency from extension manager
[ticket/11415] Move migrator to base extension class from ext.manager
[ticket/11415] Move while loop from ext manager to acp_extensions.php