Merge pull request #20170 from nextcloud/techdebt/remove-unused-imports

apps/accessibility/lib/Controller/ConfigController.php

apps/cloud_federation_api/lib/Config.php

apps/comments/lib/Controller/Notifications.php

...omments/tests/Unit/Collaboration/CommentersSorterTest.php

apps/contactsinteraction/lib/AppInfo/Application.php

apps/dav/lib/CalDAV/Activity/Provider/Event.php

apps/dav/lib/CalDAV/Calendar.php

apps/dav/lib/CalDAV/Integration/ICalendarProvider.php

...v/lib/CalDAV/ResourceBooking/AbstractPrincipalBackend.php

apps/dav/lib/CalDAV/WebcalCaching/RefreshWebcalService.php

apps/dav/lib/CardDAV/Integration/IAddressBookProvider.php

apps/dav/lib/Command/ListCalendars.php

apps/dav/lib/Command/MoveCalendar.php

apps/dav/lib/Connector/Sabre/Node.php

apps/dav/lib/Connector/Sabre/Principal.php

apps/dav/lib/Connector/Sabre/QuotaPlugin.php

apps/dav/lib/Connector/Sabre/ShareeList.php

apps/dav/lib/DAV/CustomPropertiesBackend.php

apps/dav/lib/Migration/Version1011Date20190725113607.php

apps/dav/lib/Upload/UploadFolder.php