- Add HAS_GPS=1, GPS_RX_PIN=20, GPS_TX_PIN=21
- Add TCA9535 P1.6 (GPS RST) and P1.7 (GPS EN) control via I2C
- GPS power on at boot: P1.6 and P1.7 default HIGH in init
- Bridge gps->enablePin to TCA9535 via GpioUnaryTransformer
- Add tca9535GpsReset() and tca9535GpsEn() static functions
- Update CHANGELOG with GPS support details
kevin
311232c9b9