Update to InfluxDB 2

[Mijago]

Right now, I use InfluxDB 1.8. We should update this to 2.x.

Goals of this issue:

• Update InfluxDB to 2.x
• Update the StatCollector to send to InfluxDB 2.x
• Present a simple way to migrate data from the old InfluxDB to the new one.

[DeFlanko]

ohhh yessss this is a good idea cause then we can: https://docs.influxdata.com/influxdb/v2.7/tools/flux-vscode/

[Mijago]

We could - and probably should - make an adapter that allows to switch out the backend for something else like Prometheus, Elastic Search or even something simple as MySQL.

I'll do some research within the next days to see if such a thing already exists.