add weather system #2

• parse openweathermap
• retrieve weather for current day (weather warnings)
• retrieve weather for historical day(s) (fountain size) cover this in another issue

• weather warning system (w and w/o navigation)
• fountain quality based on historical weather cover this in another issue
• sunrise/sunset (w and w/o navigation)
• temerature/sunny (w and w/o navigation, belongs to fountains) cover this in another issue
• add forecast to database?
  • Timestamp
  • min temp
  • max temp
  • location
    • lat/lon
    • name
    • country
  • sunrise/sunset
  • weather id
  • weather code
  • pressure
  • humidity
  • main?
  • desc?
  • sea level/alt
  • wind
    • speed
    • dir
  • rain
  • clouds

These steps are covered in the weatherlib. Connecting and analyse them is still not finished/started.

implement own weather class, which can be stored in the DB and also convert a weatherlib-weather object to a weather object.
This class should be able to cover the bottom list of TODOs