Logging Interface

[TheBlueMatt]

We need to convert the few printlns we have to some kind of user-provided logging interface, as well as add a ton of additional logs. I think its fine if we just make it another Arc<trait> that gets passed around everywhere and we call it directly with lines. Would be nice to avoid the format!() overhead when we dont need it, so maybe we can provide build options to turn off debug logging and avoid most of it?

[TheBlueMatt]

Tagged good first issue as at least writing the trait and passing around the Arcs everywhere should be easy, other bits can come later.

[ariard]

Just started to working on this, something like a lightweight of crate log, which use compile time filters