Initial minimal port for jumperless v5 (micropython)

[detiber]

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[detiber]

TODO (from Discord): add some safety around dacs
If you set GPIO 16 (RESET for the crossbars) high, and just send I2C to the dacs to put them in the middle of their range (or bonus points if you grab
[calibration] top_rail_zero = 1630;
[calibration] bottom_rail_zero = 1618;
[calibration] dac_0_zero = 1626;
[calibration] dac_1_zero = 1626;
from the config and set that