0027398: Integrate Qt Browser Widget to Open CASCADE Technology

The following implementation has been made:
- CMake procedure is extended to compile Qt tools. This is optional and is handled by USE_QT_TOOLS option(OFF by default)
- It is possible to build Qt tools using Qt5 or Qt4, it is settled with USE_QT4 option.
- Sample of DFBrowser tool is available in samples/tools/TInspectorEXE. It is build with tools, executable is placed in binaries. To start the sample, use dfbrowser.bat command.
- DFBrowser tool may be started from DRAW

tools/DFBrowserPane/DFBrowserPane_TDataStdTreeNodeModel.cxx

@@ -0,0 +1,43 @@
+// Created on: 2017-06-16
+// Created by: Natalia ERMOLAEVA
+// Copyright (c) 2017 OPEN CASCADE SAS
+//
+// This file is part of Open CASCADE Technology software library.
+//
+// This library is free software; you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License version 2.1 as published
+// by the Free Software Foundation, with special exception defined in the file
+// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
+// distribution for complete text of the license and disclaimer of any warranty.
+//
+// Alternatively, this file may be used under the terms of Open CASCADE
+// commercial license or contractual agreement. 
+
+#include <DFBrowserPane_TDataStdTreeNodeModel.hxx>
+#include <DFBrowserPane_TDataStdTreeNodeItem.hxx>
+
+#include <TDataStd_TreeNode.hxx>
+
+#include <QAbstractItemModel>
+
+// =======================================================================
+// function : Constructor
+// purpose :
+// =======================================================================
+DFBrowserPane_TDataStdTreeNodeModel::DFBrowserPane_TDataStdTreeNodeModel (QObject* theParent)
+: TreeModel_ModelBase (theParent)
+{
+  m_pRootItem = DFBrowserPane_TDataStdTreeNodeItem::CreateItem (TreeModel_ItemBasePtr(), 0, 0);
+}
+
+// =======================================================================
+// function : SetAttribute
+// purpose :
+// =======================================================================
+void DFBrowserPane_TDataStdTreeNodeModel::SetAttribute (const Handle(TDF_Attribute)& theAttribute)
+{
+  DFBrowserPane_TDataStdTreeNodeItemPtr aRootItem = itemDynamicCast<DFBrowserPane_TDataStdTreeNodeItem>(m_pRootItem);
+  Reset();
+  aRootItem->SetAttribute (theAttribute);
+  EmitLayoutChanged();
+}