try to use TerminalData in Terminal and PartTerminal, sou the code must not be written double

sources/properties/terminaldata.h

@@ -0,0 +1,67 @@
+#ifndef TERMINALDATA_H
+#define TERMINALDATA_H
+
+#include "propertiesinterface.h"
+#include "qet.h"
+
+#include <QUuid>
+#include <QPointF>
+
+class QGraphicsObject;
+
+/*!
+ * \brief The TerminalData class
+ * Data of the terminal. Stored in extra class so it can be used by PartTerminal and Terminal without
+ * defining everything again.
+ */
+class TerminalData : public PropertiesInterface
+{
+public:
+    TerminalData();
+    TerminalData(QGraphicsObject* parent);
+    ~TerminalData();
+
+    void setParent(QGraphicsObject* parent);
+
+    // Save/load properties to setting file. QString is use for prefix a word befor the name of each paramètre
+    void toSettings(QSettings &settings, const QString = QString()) const override;
+    void fromSettings(const QSettings &settings, const QString = QString()) override;
+    // Save/load properties to xml element
+    // This method is only called from the PartTerminal and should never called from the Terminal class
+    QDomElement toXml(QDomDocument &xml_element) const override;
+    bool fromXml(const QDomElement &xml_element) override;
+
+    // must be public, because this class is a private member of PartTerminal/Terminal and they must
+    // access this data
+public:
+    Qet::Orientation m_orientation;
+    QPointF second_point;
+    /*!
+     * \brief m_uuid
+     * Uuid of the terminal.
+     *
+     * In elementscene.cpp an element gets a new uuid when saving the element. In the current state
+     * each connection is made by using the local position of the terminal and a dynamic id. In the new
+     * case, each terminal should have it's own uuid to identify it uniquely. When changing each time this
+     * uuid, the conductor after updating the part is anymore valid. So if in the loaded document a uuid exists,
+     * use this one and don't create a new one.
+     */
+    QUuid m_uuid;
+    /*!
+     * \brief m_name
+     * Name of the element. It can be used to create wiring harness tables
+     */
+    QString m_name;
+
+    /*!
+     * \brief m_pos
+     * Position of the terminal. The second point is calculated from this position and the orientation
+     * Important: this variable is only updated during read from xml and not during mouse move!
+     * It is used to store the initial position so that PartTerminal and Terminal have access to it.
+     */
+    QPointF m_pos;
+private:
+    QGraphicsObject* q{nullptr};
+};
+
+#endif // TERMINALDATA_H