combine,compress,crypt,hasher,union: support wrapping backends with PartialUploads

This means that, for example, wrapping a sftp backend with crypt will
upload to a temporary name and then rename unless disabled with
--inplace.

See: https://forum.rclone.org/t/backup-versioning/38978/7

backend/crypt/crypt.go

@@ -268,6 +268,7 @@ func NewFs(ctx context.Context, name, rpath string, m configmap.Mapper) (fs.Fs,
 		ReadMetadata:            true,
 		WriteMetadata:           true,
 		UserMetadata:            true,
+		PartialUploads:          true,
 	}).Fill(ctx, f).Mask(ctx, wrappedFs).WrapsFs(f, wrappedFs)
 
 	return f, err