Adjust to new naming schema everywhere

README.md

composer.json

phpunit.xml.dist

src/Command/TestCommand.php

src/Controller/LoggedInOnly.php

src/DataPersister/PlaceDataPersister.php

src/DataProvider/PlaceCollectionDataProvider.php

src/DataProvider/PlaceItemDataProvider.php

src/DbpRelayTemplateBundle.php

src/DependencyInjection/Configuration.php

src/DependencyInjection/DbpRelayTemplateExtension.php

src/Entity/Place.php

src/Resources/config/services.yaml

src/Service/ExternalApi.php

src/Service/MyCustomService.php

src/Service/PlaceProviderInterface.php

tests/ApiTest.php

tests/Kernel.php

tests/Service/ExternalApiTest.php