Fixes#6948
Changes the stream_id format from
<token:64>:<rand:64>
to
<token:64>:<rand:38><index:22><version:4>
The code will attempt to assert version match when
presented with a stored id (i.e. construct from bytes).
This means that ID:s created by previous (experimental)
versions will break.
Moves the ID encoding fully into the ID class, and makes
the code path private for the topology generation code
path.
Removes some superflous accessors but adds accessors for
token, version and index. (For alternator etc).
a6ad70d3da