qet graphics table item : to/from xml change

The font, alignment and margins is not saved by the table anymore but by
the model.

sources/utils/qetutils.cpp

@@ -0,0 +1,49 @@
+/*
+        Copyright 2006-2020 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 "qetutils.h"
+#include <QString>
+#include <QStringList>
+
+QString QETUtils::marginsToString(const QMargins &margins)
+{
+    QString str;
+	str += QString::number(margins.left());
+	str += ";";
+	str += QString::number(margins.top());
+	str += ";";
+	str += QString::number(margins.right());
+	str += ";";
+	str += QString::number(margins.bottom());
+
+	return str;
+}
+
+QMargins QETUtils::marginsFromString(const QString &string)
+{
+	QMargins margins;
+	auto split = string.split(";");
+	if (split.size() != 4)
+		return  margins;
+
+	margins.setLeft  (split.at(0).toInt());
+	margins.setTop   (split.at(1).toInt());
+	margins.setRight (split.at(2).toInt());
+	margins.setBottom(split.at(3).toInt());
+
+	return  margins;
+}