Add a pimoroni.py module which includes Python code equivilents of the RGBLED and Button C++ drivers.
This is simpler than binding these drivers into MicroPython and much easier to maintain/extend.
* Bump MicroPython from v1.15 to v1.16
* Bump Blinka from 6.10.1 to 6.10.2
* Bump PlatformDetect from 3.13.3 to 3.14.1
* Revert backport patch/hotfix for lwip submodule
This new workflow will build a separate release of MicroPython that includes Blinka and PlatformDetect for compatibility with Adafruit CircuitPython .py libraries.