WIP: Add InDetRawDataContainer_p3 and TRT_LoLumRawDataContainerCnv_p3
Adding new TP Converter classes initially a copy of InDetRawDataContainer_p2
and TRT_LoLumRawDataContainerCnv_p2
, to allow TRT sub-system experts
to develop a new more compressed persistent format. Currently
these new classes are unused by default.