Release 2020.12.0

• Generic implementation of SOCOMEC meters
  Just configure Meter.Socomec.Singlephase or Meter.Socomec.Threephase. The actual type and modbus protocol of the Socomec meter is identified automatically.
• Lots of improvements under the hood
  • Add generic implementation for State-Machines
  • New OpenEMS Nature „BatteryInverter“ (ManagedSymmetricBatteryInverter, SymmetricBatteryInverter)
  • Implement Generic ManagedSymmetricEss
  • New feature „Start-Stop“
  • Add JUnit Test-Framework for all kinds of OpenemsComponents

https://github.com/OpenEMS/openems/releases/tag/2020.12.0