Support X3 Ultra

[Th3Link]

The X3 Ultra is quite a new Inverter I'd like to see supported. The data assigns are very similar to the X3 Hybrid Gen3 but has a third MPPT.
I used curl -X POST http:// -d 'optType=ReadRealTimeData&pwd=pwd' to gather some data and used numpys correlation coefficient to map them.
Working on in on https://github.com/Th3Link/solax