show debug stream as sequence chart

[ensonic]

it would be nice to capture a debug stream from the UI and render with e.g.
http://bramp.github.io/js-sequence-diagrams/

[jonnor]

Similar to #244

Btw, we now have Flowtrace support in NoFlo, which allows to persist the info to a file. So one can easily prototype/build a separate tool which gives this kind of view. https://github.com/flowbased/flowtrace