0026255: Adaptor3d_OffsetCurve is misleading

1. Rename Adaptor3d_OffsetCurve to Adaptor2d_OffsetCurve and relative classes
2. Remove redundant class Geom2dGcc_CurveToolGeo

src/Adaptor2d/Adaptor2d_OffsetCurve.lxx

@@ -0,0 +1,54 @@
+// Copyright (c) 1999-2014 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.
+
+//=======================================================================
+//function : Curve
+//purpose  : 
+//=======================================================================
+
+inline const Handle(Adaptor2d_HCurve2d)& Adaptor2d_OffsetCurve::Curve() const
+{
+  return myCurve;
+}
+
+
+//=======================================================================
+//function : Offset
+//purpose  : 
+//=======================================================================
+
+inline Standard_Real Adaptor2d_OffsetCurve::Offset() const
+{
+  return myOffset;
+}
+
+
+//=======================================================================
+//function : FirstParameter
+//purpose  : 
+//=======================================================================
+
+inline Standard_Real Adaptor2d_OffsetCurve::FirstParameter() const 
+{
+  return myFirst;
+}
+
+//=======================================================================
+//function : LastParameter
+//purpose  : 
+//=======================================================================
+
+inline Standard_Real Adaptor2d_OffsetCurve::LastParameter() const 
+{
+  return myLast;
+}