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/ShapeView/ShapeView_ItemBase.hxx

@@ -0,0 +1,48 @@
+// 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. 
+
+#ifndef ShapeView_ItemBase_H
+#define ShapeView_ItemBase_H
+
+#include <Standard.hxx>
+#include <TopoDS_Shape.hxx>
+#include <TreeModel_ItemBase.hxx>
+
+class ShapeView_ItemBase;
+typedef QExplicitlySharedDataPointer<ShapeView_ItemBase> ShapeView_ItemBasePtr;
+
+//! \class ShapeView_ItemBase
+// \brief Declaration of the tree model base item.
+class ShapeView_ItemBase : public TreeModel_ItemBase
+{
+public:
+
+  //! Resets cached values
+  virtual void Reset() Standard_OVERRIDE { TreeModel_ItemBase::Reset(); }
+
+protected:
+
+  //! Initialize the current item. It creates a backup of the specific item information
+  virtual void initItem() const {};
+
+  //! Constructor
+  //! param theParent a parent item
+  //! \param theRow the item row positition in the parent item
+  //! \param theColumn the item column positition in the parent item
+  ShapeView_ItemBase(TreeModel_ItemBasePtr theParent, const int theRow, const int theColumn)
+  : TreeModel_ItemBase (theParent, theRow, theColumn) {}
+};
+
+#endif