SofarSolar inverter integration

@sporniak

Just so you know I have started to add in support for Sofar Solar on my SolaX custom_component SolaX Inverter by Modbus (No Pocket WiFi) ( now a custom_component ) if you fancy Beta testing give it ago and let me know. (It will probably fail on the serial number check (only checks first couple of digits to determine model) but that can be easily fixed once we know what it is)