move to public namespace

apps/files_external/lib/google.php

apps/files_sharing/lib/sharedstorage.php

lib/private/connector/sabre/quotaplugin.php

lib/private/files/filesystem.php

lib/private/files/storage/common.php

lib/private/files/storage/dav.php

lib/private/files/storage/local.php

lib/private/files/storage/wrapper/quota.php

lib/private/helper.php

lib/private/util.php

lib/public/files/fileinfo.php

tests/lib/connector/sabre/quotaplugin.php