App: Add class CleanupProcess to allow to free resources when closing the application

src/App/CleanupProcess.cpp

@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+/***************************************************************************
+ *   Copyright (c) 2024 Werner Mayer <wmayer[at]users.sourceforge.net>     *
+ *                                                                         *
+ *   This file is part of FreeCAD.                                         *
+ *                                                                         *
+ *   FreeCAD is free software: you can redistribute it and/or modify it    *
+ *   under the terms of the GNU Lesser General Public License as           *
+ *   published by the Free Software Foundation, either version 2.1 of the  *
+ *   License, or (at your option) any later version.                       *
+ *                                                                         *
+ *   FreeCAD is distributed in the hope that it will be useful, but        *
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      *
+ *   Lesser General Public License for more details.                       *
+ *                                                                         *
+ *   You should have received a copy of the GNU Lesser General Public      *
+ *   License along with FreeCAD. If not, see                               *
+ *   <https://www.gnu.org/licenses/>.                                      *
+ *                                                                         *
+ **************************************************************************/
+
+#include "PreCompiled.h"
+#include <list>
+
+#include "CleanupProcess.h"
+
+
+using namespace App;
+
+namespace
+{
+    static std::list<std::function<void()>> cleanup_funcs;  // NOLINT
+}
+
+void CleanupProcess::registerCleanup(const std::function<void()>& func)
+{
+    cleanup_funcs.push_back(func);
+}
+
+void CleanupProcess::callCleanup()
+{
+    for (const auto& func : cleanup_funcs) {
+        func();
+    }
+}