Clean out debugger code

[Yatekii]

The debugger code has grown tremendously and we really need to clean it up.
Currently not even cargo fmt understands it :O

[bugadani]

We should define some goals here, or we'll have another eternally open issue.

[Yatekii]

Yeah, the idea is that we kind of make sub issues (or more precise ones). Those are only for a rough overview :)

[bugadani]

Fair, but cleaning up is a fractal task. No matter what we do, there's always more. To make this more focused, IMO, we should agree upon a set of principles to follow, criteria to meet, and then we can start asking for that from ourselves and from contributors.

[Yatekii]

Oh yeah it would be very nice to define some metrics.
If you have good ideas that would be nice, but I would say of the top of my head for me that would be:

• Functions 30-50 lines max
• Max 2 indentations excluding trait and function impl base ones.