Terminal strip Xref is clickable

When user hover the Xref string of a terminal, the string color change
to blue to advise user the xref is clickable. Double click on the blue
Xref go the folio of the terminal and zoom the view to the terminal.

sources/TerminalStrip/physicalterminal.cpp

@@ -189,6 +189,20 @@ QVector<QSharedPointer<RealTerminal>> PhysicalTerminal::realTerminals() const {
 	return m_real_terminal;
 }
 
+/**
+ * @brief PhysicalTerminal::realTerminal
+ * @param pos
+ * @return the real terminal at position pos.
+ * Note that the returned QSharedPointer can be null
+ */
+QSharedPointer<RealTerminal> PhysicalTerminal::realTerminal(int pos) const
+{
+	if (pos < m_real_terminal.size()) {
+		return m_real_terminal.at(pos);
+	}
+	else return QSharedPointer<RealTerminal>{};
+}
+
 /**
  * @brief uuid
  * @return the uuid of this physical terminal