TerminalStripLayoutPattern is now shared

TerminalStripLayoutPattern class is now a shared pointer between all
terminal strip item.
QETProject have now a new class : ProjectPropertiesHandler
the goal of this class is to manage every kind of properties used in the
project, this class will be strongly used in future.

sources/project/projectpropertieshandler.h

@@ -0,0 +1,53 @@
+/*
+    Copyright 2006-2023 The QElectroTech Team
+    This file is part of QElectroTech.
+
+    QElectroTech is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    QElectroTech 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#ifndef PROJECTPROPERTIESHANDLER_H
+#define PROJECTPROPERTIESHANDLER_H
+
+#include <QPointer>
+
+#include "../TerminalStrip/GraphicsItem/properties/terminalstriplayoutshandler.h"
+
+class QETProject;
+
+/**
+ * @brief The ProjectPropertiesHandler class
+ * A central class who handle, keep and provide all utilities
+ * to easily manage all kind of properties used in a project.
+ *
+ * This is a new class since QElectroTech 0.9
+ * by consequent she is small and you can found a lot of properties (made before qet 0.9)
+ * everywhere in the code.
+ * All new properties should be managed by this class
+ * (of course if it make sense to be managed by this class).
+ * Older properties who are not managed by this class but should be,
+ * will be managed in future.
+ */
+class ProjectPropertiesHandler
+{
+    public:
+        ProjectPropertiesHandler(QETProject *project);
+
+        TerminalStripLayoutsHandler& terminalStripLayoutHandler();
+
+    private:
+        QPointer<QETProject> m_project;
+
+        TerminalStripLayoutsHandler m_terminal_strip_layout_handler;
+};
+
+#endif // PROJECTPROPERTIESHANDLER_H