How to handle multiple inverters per plant on GoodWe

[CodeCasterNL]

When a user has multiple inverters in their plant, we only send the data of the first.

Ideas:

• Send aggregated data to PVOutput, so use multiple inverters as input, and add the power and generation together, take highest temperature and voltage.
• Allow many-to-many configuration: inverter X corresponds to PVOutput system X, Y to Y, and so on. PVOutput supports this through "parent-child" system, where they do the aggregation. PVBridge configuration file supports this, UI not yet.