earthobservations/wetterdienst: Move functionality to core components, use timezones for dates

Benjamin Gutzmann, Andreas Motl, Daniel Lassahn, Ilya Kamenshchikov & Michael Schrammel
Move more functionality into core classes Add more attributes to the core e.g. source and timezone Make dates of internal data timezone aware, set start date and end date to UTC Add issue date to Mosmix class that actually refers to the Mosmix run instead of start date and end date Use Result object for every data related return In accordance with typical naming conventions, DWDObservationSites is renamed to DWDObservationStations, the same is applied to...
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