don't use depricated OC_Filesystem

apps/files/ajax/autocomplete.php

apps/files/ajax/newfile.php

apps/files/ajax/upload.php

apps/files/appinfo/filesync.php

apps/files/download.php

apps/files/index.php

apps/files_encryption/lib/crypt.php

apps/files_encryption/lib/cryptstream.php

apps/files_encryption/lib/proxy.php

apps/files_encryption/tests/proxy.php

apps/files_external/ajax/addRootCertificate.php

apps/files_external/lib/config.php

apps/files_sharing/lib/sharedstorage.php

apps/files_sharing/public.php

apps/files_versions/lib/hooks.php

apps/files_versions/lib/versions.php

lib/connector/sabre/directory.php

lib/connector/sabre/file.php

lib/connector/sabre/node.php

lib/filechunking.php