Release Facedancer 3.1.0

[antoinevg]

This is the tracking issue for the Facedancer 3.1.0 release.

Tasks not yet associated with an Issue or Pull Request

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1. Consider supplementing the ftdi-echo example in favor of a canonical serial emulation which is not FTDI
2. Add some USB High Speed examples
3. Upgrade warning in device.py:send():286 to an Exception
4. Remove transfer limit on control IN transfers for both Cynthion and GreatFET.

Issues

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1. GreatFET One: host mode: failed to read data from endpoint 1 #74
   +0
2. Problem running USBKeyboard.py using the GreatFet One on Windows 10 #64
   technical support +1
   
3. USBMassStorageInterface / USBEndpoint object has no attribute device_class #33
   bug +1
4. Support gadget api #15
   enhancement +1
5. Update libusbhost backend to libusb1 #87
   0 of 3
   enhancement +1
   
6. Sometimes facedancer device will throw unexpected data on ep0 errors when it is, in fact, expecting data on ep0 #90
   +0
7. Remove transfer limit on control IN transfers for both Cynthion and GreatFET. #114
   enhancement +1
   

Review, merge or close outstanding pull requests

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1. New mouse peripheral and tests #94
   +0
2. New Hydradancer backend for Facedancer #93
   +0