Modules don't compose well

[svarlet]

@michalmuskala

I agree with this sooo much. I think the problem lies exactly in the fact that we can’t inject state into the Plug connections from the regular supervision structure - for any other processes we have start_link and the init callback or other mechanisms, where we can set-up the state for the process - including dependencies, but we entirely lack that possibility with plug. For some reason Plug tries to enforce completely stateless processes.

And it seems Ace/Raxx got that one right @michalmuskala