support for RP2040 and other new Jacdac brains

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[ghost]

@mmoskal

The Analog Pins are not working on Pico

I think it's because GPIO 26/27 are set up in makecode as 'Analog' but only as regular Analog Pins would be, not actually set to read through the Pico's ADC hardware.

Alternatively if pins A0 / A1 were included, those could be read as Analog, automatically read through the ADC I believe.

It would be great to getting Analog Inputs working on the Pico in MakeCode - if you have the ability to update the files, here's the documentation from Pi:

https://www.raspberrypi.com/documentation/pico-sdk/hardware.html#hardware_adc