Deprecate DataObjID{,Coll}Property in favor of Gaudi::Property<DataObjID{,Coll}>

It seems that DataObjIDProperty is not used (at least not in Gaudi itself), and if we do need Gaudi::Property<DataObjID>, it is sufficient to provide toStream(const DataObjID&,std::ostream&), toString(const DataObjID&) and parse(DataObjID&,const std::string&). DataObjIDCollProperty is used, but again, it should be sufficient to just provide the three standalone functions, and then just use a plain (unspecialized) Gaudi::Property< DataObjIDColl>...