Extension with new DWD weather data files for 2020 t0 2022

[nytschgeusen]

New DWD weather data files für the German location Potsdam for the years 2020 to 2022 shall be added.

[nytschgeusen]

@MaxUdk: please use the branch https://github.com/UdK-VPT/BuildingSystems/tree/issue175_newDWDWeatherFiles for the integration of the new DWD weather data sets.