- Use LMR38010 for internal power supply (max. 80V instead of 60V)
- Change USB connector from Micro-A to C and remove 5V power supply
  which was not working anyway. The board cannot be powered by USB
  only.
- Add TS2 (connected to DFETOFF) to measure shunt temperature
- Add RS-485 transceiver (sharing the connector with CAN)
- Switch I2C pins of ESP32-C3 to GPIO8/9. This allows to re-use the
  I2C pull-ups for strapping configuration and frees two pins for the
  RS-485 transceiver RE and DE pins. Also we may get rid of the I2C
  glitches during start-up.
- Use 80V instead of 100V power MOSFETs to reduce Rds(on).
- Reduce DSG gate resistor R57 to 47R to increase switch-off speed.
- Adjust some resistors to reduce number of different parts