Rework Configuration System

[Zoriot]

The current system have many flaws and is not really suitable for production, we should switch to Configurate or something comparable (Alps is also making the switch) - also considering the HOCON format which offers major advantages.
We also have to elaborate how to update our configurations nicely and that we support special characters like ' ä or letters in other languages.

If the current system doesn't even support configuration upgrading we have to do this more early.

[MineFact]

I would like to have a similar config system in the BTE ecosystem. What is BTE Germany currently using? Might be worth to check out what they are currently using before using a new system.