Merge pull request #17378 from owncloud/kill-more-legacy-classes

apps/files_sharing/ajax/publicpreview.php

apps/files_trashbin/lib/trashbin.php

core/ajax/preview.php

core/ajax/update.php

core/setup/controller.php

cron.php

lib/autoloader.php

lib/base.php

lib/private/app.php

lib/private/cache/file.php

lib/private/connector/sabre/file.php

lib/private/db.php

lib/private/db/connection.php

lib/private/db/statementwrapper.php

lib/private/files.php

lib/private/files/cache/cache.php

lib/private/files/cache/scanner.php

lib/private/files/mount/mountpoint.php

lib/private/files/storage/local.php

lib/private/files/view.php