MProcs like UI for parallel recipes

[nxy7]

One thing that I find very useful for my work is mprocs UI which cleanly separates all my processes.

If just 'parallel' recipes had something like that it would be nice to be able to drop mprocs (one less dependency) and I often find that if you're running many recipes in parallel you want to move around them somehow. Something like

[parallel]
up: frontend backend

frontend:
    # start FE

backend:
    # start BE

It would be nice to have easy way to see logs just from specific recipe.