Replace rusb (libusb bindings) with native Rust

[hardBSDk]

No description provided.

[tuna-f1sh]

Not personally but nusb is on my radar. It would be a pure Rust solution rather than libusb but not explored whether porting would be possible yet. Open to contributions if you're interested in exploring.

[tuna-f1sh]

@hardBSDk if you interested in testing this, the PR #26 can be built with pure Rust using --no-default-features -F=native.

[hardBSDk]

@tuna-f1sh It works but don't show the xHCI ports.

[tuna-f1sh]

Yes this was actually a change I made because by default nusb does not list xHCI (root_hubs). It made me re-think the default list and not to show them. The lsusb mode will though (since it does): cargo run --no-default-features -F=native -- --lsusb.

Do you think they are useful in the list output? I figured not since they are not something one does anything with. They are presented in --tree to show which root_hub devices are attached - I think this is useful.