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Allow implementation using both sync and async I/O; The async support is enabled with the "async" feature (assume "std"). Tested using dfu-libusb (no changes needed) and a new implementation using nusb (https://github.com/sjoerdsimons/dfu-nusb). dfu-nusb supports both sync and async support.
Fwiw, i'd be happy to host dfu-nusb in this organisation, but that's somewhat seperate from this PR :)