Color-Debug

Monkey-patches fmt machinery to colorize debug output.

Limitations

This is of course very hacky, so anything may break in the future. Known limitations include:

• Struct and tuple names can only be colorized on nightly (requires nightly feature flag).
  • Specifically, derived Debug impls use internal shorthand methods which need to be hooked. If they were not, then manual and derived impls would look different.
• Derived unit structs/variants are not colorized, as they are just a write_str call.
• Field names are not colored when using nightly-only field_with.
• References to integer types are only colorized up to a certain depth, due to inlining.