DDSPSMC — Use traits for topic/datareader/datawriter

The proposed PSM takes the DDS PSM and now gives the users templates instead of new classes as with the IDL to C++ mapping.

For example RadarTrackDataWriter becomes DataWriter<RadarTrack>.

To my idea this this is syntactical sugar and I still see how the DDS implementation implement their support. I would like to propose a different way. As user I just have RadarTrack, that is coming from my user domain, so why now create a set of traits that can be used by the end user. Than he doesn't see anything special from DDS, not whether it is a template or a class.

So he writes
RadarTrack::data_writer_type dw = pub.create_datawriter()
RadarTrack::topic_type tp = dp.create_topic().

The DDS implementation can than do anything behind data_writer_type, the only thing the user has to know are the traits and the methods that are possible to be used.

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