Add a WinUSB comms backend

[Qyriad]

Currently on Windows we require use of something like Zadig to install libusb-win32 for GreatFET. Instead we should just write a backend for communications over WinUSB.

[osterwood]

FYI, I just published a Python wrapper around wdi-simple (a command line version of Zadig and part of the libwdi repo)

https://github.com/CapableRobot/CapableRobot_USBRegister

This package includes pre-built wdi-simple CLI binaries and a python wrapper around them, allowing for automation of device to driver registration -- no more asking end users to download Zadig and click buttons.