Reorganize source files into logical subdirectories

Co-authored-by: Hirek193 <23196899+Hirek193@users.noreply.github.com>

world/station.h

@@ -0,0 +1,29 @@
+/*
+This Source Code Form is subject to the
+terms of the Mozilla Public License, v.
+2.0. If a copy of the MPL was not
+distributed with this file, You can
+obtain one at
+http://mozilla.org/MPL/2.0/.
+*/
+
+#pragma once
+
+#include "Classes.h"
+
+// a simple station, performs freight and passenger exchanges with visiting consists
+class basic_station {
+
+public:
+// methods
+    // exchanges load with consist attached to specified vehicle, operating on specified schedule; returns: time needed for exchange, in seconds
+    double
+        update_load( TDynamicObject *First, Mtable::TTrainParameters &Schedule, int const Platform );
+};
+
+namespace simulation {
+
+extern basic_station Station; // temporary object, for station functionality tests
+
+} // simulation
+