Since there are many weather services that provide an API
for fetching weather, and some don't work in other countries,
this patch adds a new service abstraction for weather.
the user configures which weather service they want to use in the config
file, then that service is loaded at start time, and the weather plugin
uses the WeatherService object to fetch the weather for a lat,lon combo.
The WeatherService itself calls the configured service object that
fetches and returns the weather. There is only 1 weather service
in this patch, which is the same as it used to be. calling
forecast.weather.gov, which is a US government API.
This patch adds a new CLI app called aprsd-dev. arpsd-dev is
used specifically for developing plugins. It allows you to run a
plugin directly without the need to run aprsd server.
This patch also adds the Weather Metar plugin called WxPlugin.
You can use it to fetch METAR from the nearest station for a callsign
or from a known METAR station id. Call WxPlugin with a message of
'wx' for closest metar station or 'wx KAUN' for metar at KAUN wx station
Hemna