Add option to show hourly forecast in increments (#2998)

Adds new config option to show weather forecast for every X hour
(default value is 1 which reflects the current behaviour)
Also adds tests for hourly forecast
Fixes #2996

Co-authored-by: veeck <michael@veeck.de>

tests/configs/modules/weather/hourlyweather_options.js

@@ -0,0 +1,26 @@
+/* MagicMirror² Test config hourly weather options
+ *
+ * By rejas https://github.com/rejas
+ * MIT Licensed.
+ */
+let config = {
+	timeFormat: 12,
+
+	modules: [
+		{
+			module: "weather",
+			position: "bottom_bar",
+			config: {
+				type: "hourly",
+				location: "Berlin",
+				mockData: '"#####WEATHERDATA#####"',
+				hourlyForecastIncrements: 2
+			}
+		}
+	]
+};
+
+/*************** DO NOT EDIT THE LINE BELOW ***************/
+if (typeof module !== "undefined") {
+	module.exports = config;
+}