0022651: Impossible to build OCC as static library due to using Standard_EXPORT instead of Standard_API

All library-specific macros for defining export / import properties of symbols on Windows (like Standard_API, __Draw_API, _math_API etc.) are eliminated.
Common macro Standard_EXPORT is used in all places where it is necessary.

New macro OCCT_STATIC_BUILD is defined for disabling Standard_EXPORT, to be used instead of HAVE_NO_DLL, though the latter is still supported as well (for compatibility).

To allow building OCCT in static mode on Windows after these changes:
- Files OSD_WNT_1.hxx and OSD_WNT_BREAK.hxx are removed; useful declarations are moved to OSD_WNT.hxx
- In the class IVtkVTK_ShapeData, static fields ARRNAME_MESH_TYPES and ARRNAME_SUBSHAPE_IDS are converted to static inline functions
- Global array ChoixRef defined in IntImp_ComputeTangence.cxx is converted to static function returning element of the array by index
- Unused class Quantity_Convert is removed (it had static field accessed by inline method)
- Struct Approx_Data defined in the same way in BRepApprox_Approx.hxx and GeomInt_WLApprox.hxx is made private member of these classes to avoid name clash
- Some C++ files producing no object code are removed
- In NCollection_EBTree.hxx and StdLPersistent_Collectio.hxx, definition of template virtual method is moved to class definition to avoid MSVC linker warnings on unused symbols

src/ApproxInt/ApproxInt_MultiLineTool.gxx

@@ -1,22 +0,0 @@
-// Created on: 1993-03-30
-// Created by: Laurent BUCHARD
-// Copyright (c) 1993-1999 Matra Datavision
-// 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.
-
-//-- Standard_Integer Approx_NbP3d = 1;
-//-- Standard_Integer Approx_NbP2d = 2;
-
-
-
-

src/ApproxInt/FILES

@@ -1,7 +1,6 @@
 ApproxInt_Approx.gxx
 ApproxInt_ImpPrmSvSurfaces.gxx
 ApproxInt_MultiLine.gxx
-ApproxInt_MultiLineTool.gxx
 ApproxInt_KnotTools.hxx
 ApproxInt_KnotTools.cxx
 ApproxInt_MultiLineTool.lxx