Reorganize source files into logical subdirectories

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

simulation/simulation.h

@@ -0,0 +1,99 @@
+/*
+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 "simulationstateserializer.h"
+#include "Classes.h"
+#include "Event.h"
+#include "Train.h"
+#include "particles.h"
+
+#ifdef WITH_LUA
+#include "lua.h"
+#endif
+
+namespace simulation {
+
+class state_manager {
+
+public:
+// methods
+    void
+        init_scripting_interface();
+    // legacy method, calculates changes in simulation state over specified time
+    void
+        update( double Deltatime, int Iterationcount );
+    void
+        update_clocks();
+    void
+        update_scripting_interface();
+    // process input commands
+    void
+        process_commands();
+ 	// create model from node string
+	TAnimModel *
+	    create_model(const std::string &src, const std::string &name, const glm::dvec3 &position);
+	// create eventlauncher from node string
+	TEventLauncher *
+	    create_eventlauncher(const std::string &src, const std::string &name, const glm::dvec3 &position);
+	// delete TAnimModel instance
+	void
+	    delete_model(TAnimModel *model);
+	// delete TEventLauncher instance
+	void
+	    delete_eventlauncher(TEventLauncher *launcher);
+	// starts deserialization from specified file, returns context pointer on success, throws otherwise
+	std::shared_ptr<deserializer_state>
+	    deserialize_begin(std::string const &Scenariofile);
+	// continues deserialization for given context, amount limited by time, returns true if needs to be called again
+	bool
+	    deserialize_continue(std::shared_ptr<deserializer_state> state);
+    // stores class data in specified file, in legacy (text) format
+    void
+        export_as_text( std::string const &Scenariofile ) const;
+
+private:
+// members
+    state_serializer m_serializer;
+    struct {
+        std::shared_ptr<TMemCell> weather, time, date;
+    } m_scriptinginterface;
+};
+
+// passes specified sound to all vehicles within range as a radio message broadcasted on specified channel
+void radio_message( sound_source *Message, int const Channel );
+
+extern state_manager State;
+extern event_manager Events;
+extern memory_table Memory;
+extern path_table Paths;
+extern traction_table Traction;
+extern powergridsource_table Powergrid;
+extern instance_table Instances;
+extern vehicle_table Vehicles;
+extern train_table Trains;
+extern light_array Lights;
+extern sound_table Sounds;
+extern particle_manager Particles;
+#ifdef WITH_LUA
+extern lua Lua;
+#endif
+
+extern scene::basic_region *Region;
+extern TTrain *Train;
+
+extern uint16_t prev_train_id;
+extern bool is_ready;
+
+struct deserializer_state;
+
+} // simulation
+
+//---------------------------------------------------------------------------