Doughing In temperature control

• Add "PID when Doughing-in" option in "PID-PWM" setting.
  • If it is set to "NO", the heater will be turned off after temperature reached and "Continue? OK" is confirmed, before "Mash-in OK" is pressed.
  • If "YES", the PID will be applied during doughing in, the setting temperature will be the temperature of first mash rest.
• Add Plato/Gravity for recipe viewing
• Add kettle thermo-mass option
  • in uint of water equivalence amount