DData based projection should not rebuild the view from scratch

[hseeberger]

One possible solution could be to make the UserProjection a persistent actor and change the stream processing such that after the view data has been replicated in a reliable way (use WriteMajority or such) the last sequence number is stored as persistent state.

This is currently not possible because of the limitiations of Typed Persistence, namely the fact that a persistent behavior cannot be supervised.