Merge pull request #24619 from owncloud/files_external-psr4

apps/files_external/appinfo/app.php

apps/files_external/appinfo/info.xml

apps/files_external/appinfo/register_command.php

apps/files_external/appinfo/routes.php

apps/files_external/appinfo/update.php

apps/files_external/lib/AppInfo/Application.php

apps/files_external/lib/Command/Applicable.php

apps/files_external/lib/Command/Backends.php

apps/files_external/lib/Command/Config.php

apps/files_external/lib/Command/Create.php

apps/files_external/lib/Command/Delete.php

apps/files_external/lib/Command/Export.php

apps/files_external/lib/Command/Import.php

apps/files_external/lib/Command/ListCommand.php

apps/files_external/lib/Command/Option.php

apps/files_external/lib/Command/Verify.php

apps/files_external/lib/Config/ConfigAdapter.php

apps/files_external/lib/Controller/AjaxController.php

...iles_external/lib/Controller/GlobalStoragesController.php

apps/files_external/lib/Controller/StoragesController.php