Add support for weewx-DWD

[Daveiano]

Add support for various data generated by https://github.com/roe-dl/weewx-DWD

Research

Output from wget-dwd:

bwk_bodendruck_na_ana.png - Pressure map north atlantic
bwk_bodendruck_weu_ana.png - Pressure map west Europe
SchilderLZ.jpg - Warning map
VHDL[50-54]_DWLG_LATEST.html - Forecast as text. Where DLWG in the filename is the counties, see https://github.com/roe-dl/weewx-DWD/wiki/Abk%C3%BCrzungen-der-Bundesl%C3%A4nder-beim-Deutschen-Wetterdienst

Output from dwd-warnings:

warn-[BBL].inc - Warnings as includable tamplate
warn-[BBL].json - Warnings as json
Where [BBL] comes from the weewx.conf:

[DeutscherWetterdienst]
    path='/home/dba/dev/test'
    [[warning]]
        icons='../dwd/warn_icons_50x50'
        states='Sachsen'
        [[[counties]]]
              'Kreis Bautzen - Tiefland'='BTL'
              'Kreis Bautzen - Bergland'='BBL'
        [[[cities]]]
              'Dresden'='DD'

Output from ./dwd-cap-warnings --weewx --resolution=city:

warn-[DD].inc and warn-[DD].json - Same as dwd-warnings but for the cities

dwd-warnings Icons https://www.dwd.de/DE/wetter/warnungen_aktuell/kriterien/warnkriterien.html

Output from ./dwd-mosmix --weewx --daily --hourly O461:

Where O461 is the station id, see https://www.dwd.de/DE/leistungen/met_verfahren_mosmix/mosmix_stationskatalog.cfg?view=nasPublication&nn=16102
forecast-O461.inc - Forecast for station id as includable template
forecast-O461.json - - Forecast for station id as json
forecast-O461-hourly.inc - hourly forecast for station id as an includable template

Output from ./dwd-mosmix --weewx --daily --hourly --database O461

dwd-forecast-O461.sdb - The forecast data as SQLite

dwd-mosmix Icons
https://www.dwd.de/DE/wetter/warnungen_aktuell/objekt_einbindung/icons/zuordnung_begriffe_wettericons.pdf;jsessionid=E1457BFD01B4C5DA438980E7DC67CEE6.live11042?__blob=publicationFile&v=2
https://www.dwd.de/DE/wetter/warnungen_aktuell/objekt_einbindung/piktogramm_node.html

dwd-mosmix needs this in weewx.conf

[DeutscherWetterdienst]
    [[forecast]]
        icons='../images'
        orientation=h,v
        #show_obs_symbols = True # optional
        #show_obs_description = False # optional
        #show_placemark = True # optional

• Images (pressure, warnings)
• Forecast as text (VHDL files)
• dwd Warnings
• Forecast mosmix
• Forecast mosmix hourly
• Document
• Test (add good example output from weewx-DWD to test/ folder and add to Dockerfile, use in custom run)

[Daveiano]

Related to #71

[Daveiano]

Support for showing the Meteogram (https://github.com/roe-dl/weewx-DWD#wettervorhersage-als-diagramm) will be available when #75 and #73 are completed.

v2.3.0 of the skin will include support for every feature from weewx-DWD, except the forecast diagram.