Switch to nusb

[beriberikix]

https://github.com/kevinmehall/nusb

nusb is a pure Rust USB implementation. One reason to switch is because it using native OS APIs, and there tends to be issues interfacing with USB devices that don't rely on libusb. That's not an rusb issues, it's a limitation of USB libraries that only support libusb.

[jiegec]

Nice suggestion! I think we can add a feature to select between nusb and rusb.