Feature/victron multiplus ess

[opernikus]

Hi Simon,
it's really bad luck that we developed a victron driver at the same time. Unfortunately we have two very different versions of an implementation. Both bundles support features which are missing in the other bundle.
The victron bundle is more than a simple driver. it is its own "ecosystem". I tried my very best to merge both bundles together.

Here are an overview of my changes:

• renamend bundle and packages ..edge.ess.victron.. to ..edge.batteryinverter.victron.. (because in my opinion this should be a batterybundle and not an ess bundle, see below why)
• added a pvinverter package
• renamed your meter to meter.victron.acout
• added a new meter meter.victorn.grid
• renamed your ess package to batteryinverter.victron.rw (because your bundle can write to the battery)
• added a new bundle batteryinverter.victron.ro (because our bundle is only a monitor right now)

Note that there is a generic ESS implementation, e.g. ESS Generic Managed Symmetric. To get an ESS you can use the ESS generic controller and connect it to a batteryinverter and to a battery and you will have full ESS capability. In my opinion we should use this mechanism also on victron. And I think, that you may not have heard of this.

There is one step missing on the integration. We should merge batteryinverter.victron.rw and batteryinverter.victron.ro.
I already wanted to do that, but it took my the whole day to merge our changes in your bundle and to refactor the code. And I fear that this merge will took another day.
Both of us should be able to run their project with the current solution. So it is ok for me.

Due to our parallel work, this change is a massive change of your code. I don't know how to handle this and I hope you'll go easy on me.