Revamp terminalStrip feature code

Move RealTerminal class in a new file
Move PhysicalTerminal class in a new file.
Remove the use of QWeakPointer and use instead QSharedPointer
in a big part of the revamp.

sources/TerminalStrip/physicalterminal.h

@@ -0,0 +1,96 @@
+/*
+	Copyright 2006-2021 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 PHYSICALTERMINAL_H
+#define PHYSICALTERMINAL_H
+
+#include <QSharedPointer>
+#include <QDomElement>
+#include <QPointer>
+#include <QUuid>
+
+class RealTerminal;
+class TerminalStrip;
+
+/**
+ * @brief The PhysicalTerminal class
+ * Represent a physical terminal.
+ * A physical terminal is composed a least by one RealTerminal.
+ * When a physical terminal have more than one real terminal
+ * that mean the physical terminal have levels (one by real terminal).
+ * The index of real terminals returned by the function terminals()
+ * is the same as the real level of the real terminal, the index are from back to front.
+ *
+ * Example for a 3 levels terminal.
+ * index 0 = back (mounting plate)
+ * index 1 = middle
+ * index 2 = front (electrical cabinet door)
+ *
+ *	m
+ *	o	  _
+ *	u	 | |
+ *	n	 | | _
+ *	t	 | || |
+ *	i	 | || | _
+ *	n	 | || || |   d
+ *	g	 |0||1||2|   o
+ *		 | || ||_|   o
+ *	p	 | || |      r
+ *	l	 | ||_|
+ *	a	 | |
+ *	t	 |_|
+ *	e
+ *
+ *
+ */
+class PhysicalTerminal
+{
+		friend class TerminalStrip;
+
+	private:
+		PhysicalTerminal(TerminalStrip *parent_strip, QVector<QSharedPointer<RealTerminal>> terminals);
+		QSharedPointer<PhysicalTerminal> sharedRef();
+		QWeakPointer<PhysicalTerminal> weakRef();
+
+		QDomElement toXml(QDomDocument &parent_document) const;
+
+		void setTerminals(const QVector<QSharedPointer<RealTerminal>> &terminals);
+		void addTerminal(const QSharedPointer<RealTerminal> &terminal);
+		bool removeTerminal(const QSharedPointer<RealTerminal> &terminal);
+
+		bool setLevelOf(const QSharedPointer<RealTerminal> &terminal, int level);
+
+	public:
+		PhysicalTerminal(){}
+
+		int levelCount() const;
+		int levelOf(const QSharedPointer<RealTerminal> &terminal) const;
+		QVector<QSharedPointer<RealTerminal>> realTerminals() const;
+		QUuid uuid() const;
+		int pos() const;
+		int realTerminalCount() const;
+
+		static QString xmlTagName();
+
+	private:
+		QPointer<TerminalStrip> m_parent_terminal_strip;
+		QVector<QSharedPointer<RealTerminal>> m_real_terminal;
+		QUuid m_uuid = QUuid::createUuid();
+		QWeakPointer<PhysicalTerminal> m_this_weak;
+};
+
+#endif // PHYSICALTERMINAL_H