Wireless hid recipes & some minor improvements

[2bndy5]

I threw together a couple recipes. These recipes aim to mimic the logitech unifying peripherals.

1. wireless_hid_hub.py: A simplistic program to receive HID report data buffers and forward them to the USB connection.
   • Currently implemented is
     • mouse
     • keyboard
     • gamepad
     • consumer HID (multimedia keypads)
   • Each HID profile is dedicated to pipes 1-4. Pipe 0 is used for pairing (which is only open for 60 seconds upon program start). Pipe 5 is closed, but it mainly reserved for a future feature like a MIDI input/output controller. This recipe will not work on the raspberry pi because the adafruit_blinka library does not provide the usb_hid module that is included with practically all circuitpython firmware.
2. wireless_hid_mouse.py: Simply pairs with the wireless_hid_hub and sends out a HID report buffer that resembles a USB mouse. Unlike other circuitpython libraries, this recipe supports the scroll wheel, middle (scroll wheel) button, and the special mouse buttons "forward" & "backward".

Other minor fixes

• close_rx_pipe() now properly prevents the listen attribute from overriding the pipe 0 reading address
• print_details() now prints a more accurate representation of the addresses used on the pipes. Like the TMRh20 RF24 library's printDetails(), the address now prints a "hexlified" string in big endian form.
• NEW address_repr() helper function (belonging to the rf24.py module nut not the RF24 class) is the helper function that returns the address specified as a "hexlified" string in big endian form.