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/TerminalStrip/GraphicsItem/terminalstripitem.h

@@ -50,6 +50,11 @@ class TerminalStripItem : public QetGraphicsItem
 
         void refreshPending();
 
+        void setLayout(QSharedPointer<TerminalStripLayoutPattern> layout);
+
+    private:
+        void setDefaultLayout();
+
 	private:
 		QPointer<TerminalStrip> m_strip;
 		TerminalStripDrawer m_drawer;