!str #15604: Removal of default fanout

TickPublisher does not benefit from the stock FanoutBox, so attaching the current fanout() will not work as intended, but of course one can always fire up a new TickPublisher for each stream (but then multiple streams need to register their own scheduled events instead of sharing the same). WIth IterablePublisher the fanout is very specific as it replays the same stuff to every subscriber -- this cannot agan be achieved with the current fanout() but one can create as many of them as he wants. In fact it fires up Workers already, and in the lazy materialization pull request it "secretly" creates copies of it anyway.