Enhancements

[Hellowlol]

• [x] go async PR #27
• [x] sniff the serial data and set the parser automatically PR #25
• [ ] improve logging
• [x] bring back yaml. (Many users prefer yaml, like me) PR #20
• [x] restore last known states PR #24

I can help out with this.

[JLFN]

How many sensors should i get? this is the info for mine HAN kamstrup. Here the result i get .

[turbokongen]

That looks perfect 👌🏻 14 is max number of sensors for 3phase meters.