This doesn't need to be be in the first release but I would like an exposed Qt interface to fsetxattrs and xgetxattrs.
Ideally this would be exposed in the File object, maybe with some sort of QVariantMap userProperties() method. FileFetchJob would then load all the properties in the same way ratings/comments/tags are now. Ratings etc. become just specially named entries in this map with convenience methods to get/set them. This is really needed in order to complete the porting of kdenlives usage where we are tagging custom attributes (license type + creator)
