HID Gamepad Core Support for 3.x

[eighthree]

Hi folks! I'm currently using a feather m0 and a joy featherwing as a HID Keyboard device for a RetroPie build and would love to have HID Gamepad support for 3.0 :)

Would love to help test this as well.

[tannewt]

@dhalbert Is this on your radar for your USB work?

[dhalbert]

Implemented by #776. @eighthree: this should be in the next 3.0 alpha. Thanks for testing, if you have a chance! See #776 and adafruit/Adafruit_CircuitPython_HID#19 for details.