Implemented WriterTopic

As subject says. 

 I leaved signal for now in its form but will look on that laters. I may actually treat queue a bit like topic (making enque A=>Task[Unit] istead just A=>Unit like it is today. I need to think about this more as I beleive maybe both queue and signal can be expressed in form on wye...

 I have also renamed Process1W to  Writer1

@pchiusano can you quickly look on this before I will merge?