Support for microphone level.

[microbit-robert]

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[microbit-robert]

@microbit-matt-hillsdon Let's discuss the comments in microbithal_js.c for the microphone functions to make sure I've not missed anything important.

[microbit-matt-hillsdon]

I accidentally broke this because I didn't realise that 0,1 and 1,2 are both used to represent quiet/low and loud/high.
If this PR is merged then we can just bump MicroPython, otherwise we need a different conversion for the 0,1 case (set_threshold).

[microbit-matt-hillsdon]

I accidentally broke this because I didn't realise that 0,1 and 1,2 are both used to represent quiet/low and loud/high. If this PR is merged then we can just bump MicroPython, otherwise we need a different conversion for the 0,1 case (set_threshold).

Put in a workaround on the assumption we'll merge this. If not I'll redo to have separate conversions.