Goodwe

Fix power factor scale, so the values are in proper -1 to 1 range.
Fix house_consumption for ES inverter, backup-up line consumption was not included.

Decode diagnostic status bits to human readable messages for ET and ES based inverters.

Major overhaul of the source code and API incorporating code from the HomeAssistant plugin.
The library now supports broad range of GoodWe inverters and lots of new sensors and settings.
The old API based on GoodWeInverter and GoodWeXSProcessor is still there for backwards compatibility (for XS inverters only),
but the new API based on Inverter class is the preferred one.

Initial release