[Ovmsdev] Units, PIN

In the US, temps are Fahrenheit and tire pressure in PSI. I don't want a PIN lock on the app, so at least make it optional. If you're going to do a lock, just put it on the actions that potentially change the car (enable CAN Write, start charging, change charge settings, wakeup the car, etc.). We already have VDS PIN locks on the lock and valet mode. I'd suggest using the existing OVMS Module Password rather than create yet another Password/PIN for people to remember. - Bennett