0024023: Revamp the OCCT Handle -- general

Missing headers added; includes of headers "Handle_...hxx" removed.

Misuses of macro Handle() and its use in typedefs corrected.

Alias classes Profile and Option are removed from IFSelect; ones defined in MoniTool are used directly.

Removed header files defining only Handle classes (except Image_PixMap_Handle.hxx)

Classes SelectMgr_BaseFrustum and now inherit Standard_Transient and can be manipulated by Handle (not NCollection_Handle)

Fixed reference-type local variable pointing to temporary object

Use of handle in conditional expressions and comparisons to NULL are replaced by call to method IsNull()

src/IVtk/IVtk_IShape.hxx

@@ -19,6 +19,7 @@
 #include <IVtk_Interface.hxx>
 #include <IVtk_Types.hxx>
 
+class IVtk_IShape;
 DEFINE_STANDARD_HANDLE( IVtk_IShape, IVtk_Interface )
 
 //! @class IVtk_IShape 

src/IVtk/IVtk_IShapeData.hxx

@@ -19,6 +19,7 @@
 #include <IVtk_Interface.hxx>
 #include <IVtk_Types.hxx>
 
+class IVtk_IShapeData;
 DEFINE_STANDARD_HANDLE( IVtk_IShapeData, IVtk_Interface )
 
 //! @class IVtk_IShapeData

src/IVtk/IVtk_IShapeMesher.hxx

@@ -20,6 +20,7 @@
 #include <IVtk_IShape.hxx>
 #include <IVtk_IShapeData.hxx>
 
+class IVtk_IShapeMesher;
 DEFINE_STANDARD_HANDLE( IVtk_IShapeMesher, IVtk_Interface )
 
 //! @class  IVtk_IShapeMesher 

src/IVtk/IVtk_IShapePickerAlgo.hxx

@@ -19,6 +19,7 @@
 #include <IVtk_IView.hxx>
 #include <IVtk_IShape.hxx>
 
+class IVtk_IShapePickerAlgo;
 DEFINE_STANDARD_HANDLE( IVtk_IShapePickerAlgo, IVtk_Interface )
 
 //! @class IVtk_IShapePickerAlgo 

src/IVtk/IVtk_IView.hxx

@@ -22,6 +22,7 @@
 #include <gp_Pnt.hxx>
 #include <Graphic3d_Mat4d.hxx>
 
+class IVtk_IView;
 DEFINE_STANDARD_HANDLE( IVtk_IView, IVtk_Interface )
 
 //! @class IVtk_IView 

src/IVtk/IVtk_Interface.hxx

@@ -19,6 +19,7 @@
 #include <Standard_Type.hxx>
 #include <Standard_Transient.hxx>
 
+class IVtk_Interface;
 DEFINE_STANDARD_HANDLE( IVtk_Interface, Standard_Transient )
 
 //! @class IVtk_Interface