Weather config enhancement

Add new parameter 'useKmh' to display wind speed in km/h instead of m/s.

modules/default/weather/weatherobject.js

@@ -77,6 +77,11 @@ class WeatherObject {
 		return 12;
 	}
 
+	kmhWindSpeed() {
+		const windInKmh = this.windUnits === "imperial" ? this.windSpeed * 1.609344 : (this.windSpeed * 60 * 60) / 1000;
+		return windInKmh;
+	}
+	
 	nextSunAction() {
 		return moment().isBetween(this.sunrise, this.sunset) ? "sunset" : "sunrise";
 	}