Test the current weather data that is converted by the DWD tools

[t-ober]

Test the current weather data that is converted by the DWD tools. There are probably inconsistencies in the icon data model that have to be tackled.

[t-ober]

Works with one caveat: DWD calls the time based colum date instead of time which is addressed here: ie3-institute/DWDWeatherTools#3