Implement RAW_IO with WinUSB

[JVital2013]

At the request of @martinling, here's a draft PR that implements RAW_IO on Windows, using libusb/libusb#1512. The change checks if RAW_IO is available, and if it is, it turns it on for the RX_ENDPOINT_ADDRESS. I've made it silently ignore the result of libusb_endpoint_set_raw_io, since in the unlikely event of the call not working, I'd think we should continue on anyway.

This change fixes sample drops on problematic Windows machines. I've marked the PR a draft because this change will require #if LIBUSB_API_VERSION >= 0x0100010B ... #endif to prevent issues when building with older versions of LibUSB. The problem is:

• The change isn't actually merged into LibUSB yet (hopefully it is soon!)
• LIBUSB_API_VERSION has not been bumped yet. It's still sitting at 0x0100010A, so there's no good way to detect the presence of this function

While we wait for upstream devs, let me know if you'd like to see any changes to this!