QETProject have is own database + add widget to edit nomenclature model

QETProject have is own ProjectDataBase, then when the database is
updated, everything that need the database is also updated trough the
signal emitted by the database.
Begin a widget to edit the NomenclatureModel

sources/factory/propertieseditorfactory.h

@@ -0,0 +1,34 @@
+/*
+        Copyright 2006-2020 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 PROPERTIESEDITORFACTORY_H
+#define PROPERTIESEDITORFACTORY_H
+
+#include <QList>
+
+class QAbstractItemModel;
+class QGraphicsItem;
+class PropertiesEditorWidget;
+class QWidget;
+
+namespace PropertiesEditorFactory
+{
+	PropertiesEditorWidget *propertiesEditor(QAbstractItemModel *model, PropertiesEditorWidget *editor = nullptr, QWidget *parent=nullptr);
+	PropertiesEditorWidget *propertiesEditor(QList<QGraphicsItem *> items, PropertiesEditorWidget *editor = nullptr, QWidget *parent = nullptr);
+}
+
+#endif // PROPERTIESEDITORFACTORY_H