+per #15424 Added PersistentView, deprecated View

A PersistentView works the same way as View did previously, except:

* it requires an `peristenceId` (no default is provided)
* messages given to `receive` are NOT wrapped in Persistent()

https://github.com/akka/akka/issues/15424
No good reason not to I think.
If it's fatal we might as well blow up completely ASAP.

Fixed