Swindle : Voltage translator merged

The latest bunch of change was merged. The main change is the addition of a voltage translator to allow operation with a lower voltage chip. There is a jumper to select between native (3.3v) and translated (1.2, 1.5, ..) voltage Example with a RP2040 + Carrier board with voltage translators (They are a pain to solder btw, i put them too close to each others). Only CH32V3xx and RP2040 for now !