Additional device for Espruino to support 8 pins in parallel (for discussion)

Just looking at your code, you use GPIO.out_w1tc/GPIO.out_w1ts. This is really very similar to what we do for STM32 already: https://github.com/espruino/Espruino/blob/e06b3e24de42adb1de6e2cc6046e525880760e7d/src/jswrap_io.c#L462

There's a function called jshGetPinAddress: https://github.com/espruino/Espruino/blob/e06b3e24de42adb1de6e2cc6046e525880760e7d/src/jswrap_io.c#L574

While this only deals with one address for a pin (which only seems to work on STM32) we could extend that to return:

• An address for setting a pin
  
• An address for clearing a pin
  
• A bit mask for the pin
  
  

That would work on nRF52/ESP32 and STM32, and then we could have a fast shiftOut (and also software SPI IIRC) on all platforms, really easily.