[TASK] Fix copyright information

Classes/Controller/AbstractController.php

Classes/Controller/BackLinkTestController.php

Classes/Controller/ContentComparisonTestController.php

Classes/Controller/LinkCheckController.php

Classes/Controller/OverviewController.php

Classes/Controller/RedirectTestCategoryController.php

Classes/Controller/RedirectTestController.php

Classes/Domain/Model/BackLinkTest.php

Classes/Domain/Model/ContentComparisonTest.php

Classes/Domain/Model/LinkCheck.php

Classes/Domain/Model/RecordSet.php

Classes/Domain/Model/RedirectTest.php

Classes/Domain/Model/RedirectTestCategory.php

Classes/Domain/Model/TestableInterface.php

Classes/Domain/Repository/AbstractRepository.php

Classes/Domain/Repository/BackLinkTestRepository.php

...ses/Domain/Repository/ContentComparisonTestRepository.php

Classes/Domain/Repository/LinkCheckRepository.php

Classes/Domain/Repository/RecordSetRepository.php

Classes/Domain/Repository/RedirectTestCategoryRepository.php