✨ Internal train network structure

- Defines Network, StopArea, StopPoints and JourneySections
- Loads them from json using the build_from_json method

lib/trenesis/geojson.h

@@ -0,0 +1,10 @@
+#pragma once
+
+namespace trenesis {
+	struct Point {
+		double longitude;
+		double latitude;
+
+		Point(double longitude, double latitude);
+	};
+}