Reorganize source files into logical subdirectories

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

model/MdlMngr.h

@@ -0,0 +1,42 @@
+/*
+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"
+
+class TMdlContainer {
+    friend class TModelsManager;
+private:
+    TModel3d *LoadModel( std::string const &Name, bool const Dynamic );
+    std::shared_ptr<TModel3d> Model { nullptr };
+    std::string m_name;
+};
+
+// klasa statyczna, nie ma obiektu
+class TModelsManager {
+public:
+    // McZapkie: dodalem sciezke, notabene Path!=Patch :)
+	static TModel3d *GetModel(std::string const &Name, bool const dynamic = false, bool const Logerrors = true , int uid = 0);
+
+private:
+// types:
+    typedef std::deque<TMdlContainer> modelcontainer_sequence;
+    typedef std::unordered_map<std::string, modelcontainer_sequence::size_type> stringmodelcontainerindex_map;
+// members:
+    static modelcontainer_sequence m_models;
+    static stringmodelcontainerindex_map m_modelsmap;
+// methods:
+	static TModel3d *LoadModel(std::string const &Name, const std::string &virtualName, bool const Dynamic );
+    static std::pair<bool, TModel3d *> find_in_databank( std::string const &Name );
+    // checks whether specified file exists. returns name of the located file, or empty string.
+    static std::string find_on_disk( std::string const &Name );
+
+};
+
+//---------------------------------------------------------------------------