IS31FL3731 (11x7 and 5x5 matrix displays)

[Gadgetoid]

• [x] CPython
  • [x] RGB Matrix 5x5 - https://github.com/pimoroni/rgbmatrix5x5-python/
  • [x] Matrix 11x7 - https://github.com/pimoroni/matrix11x7-python/
  • [ ] Generic IS31FL3731 driver
• [x] CircuitPython Library - https://github.com/adafruit/Adafruit_CircuitPython_IS31FL3731
• [ ] Pico
  • [x] Pico SDK C++ Library
  • [x] Python Bindings
  • [x] Examples
  • [ ] Documentation
  • [ ] Pi
  • [x] In breakouts.config - https://github.com/pimoroni/breakout-garden/blob/master/breakouts.config

[Gadgetoid]

• [x] Raised as PR - https://github.com/pimoroni/pimoroni-pico/pull/15
• [x] Merged into breakouts-dev - https://github.com/pimoroni/pimoroni-pico/tree/breakouts-dev/drivers/is31fl3731
• [x] 11x7 matrix Python Driver - https://github.com/pimoroni/pimoroni-pico/tree/breakouts-dev/micropython/modules/breakout_matrix11x7
• [x] 5x5 RGB matrix Python Driver - https://github.com/pimoroni/pimoroni-pico/blob/breakouts-dev/micropython/modules/breakout_rgbmatrix5x5/breakout_rgbmatrix5x5.cpp
• [x] Basic 11x7 matrix example - https://github.com/pimoroni/pimoroni-pico/blob/breakouts-dev/micropython/examples/breakout_matrix11x7/demo.py
• [x] Basic 5x5 matrix example - https://github.com/pimoroni/pimoroni-pico/blob/breakouts-dev/micropython/examples/breakout_rgbmatrix5x5/demo.py

[Gadgetoid]

Could stand to have a few more C++ and Python examples.

[Gadgetoid]

Rescued this from our exploded breakouts-dev branch into a new PR: https://github.com/pimoroni/pimoroni-pico/pull/130

Accidentally forgot we had a working 11x7 driver and rewrote it. All much for muchness.

[Gadgetoid]

Merged https://github.com/pimoroni/pimoroni-pico/pull/130

[Gadgetoid]

Released https://github.com/pimoroni/pimoroni-pico/releases/tag/v0.1.3