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.cpp

@@ -0,0 +1,30 @@
+/*
+    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/>.
+*/
+#include "projectpropertieshandler.h"
+
+#include "../qetproject.h"
+
+ProjectPropertiesHandler::ProjectPropertiesHandler(QETProject *project) :
+    m_project(project)
+{
+}
+
+TerminalStripLayoutsHandler &ProjectPropertiesHandler::terminalStripLayoutHandler()
+{
+    return m_terminal_strip_layout_handler;
+}