STYLE: Add itkVirtualGetNameOfClassMacro + itkOverrideGetNameOfClassMacro

Added two new macro's, intended to replace the old 'itkTypeMacro' and
'itkTypeMacroNoParent'.

The main aim is to be clearer about what those macro's do: add a virtual
'GetNameOfClass()' member function and override it. Unlike 'itkTypeMacro',
'itkOverrideGetNameOfClassMacro' does not have a 'superclass' parameter, as it
was not used anyway.

Note that originally 'itkTypeMacro' did not use its 'superclass' parameter
either, looking at commit 699b66cb04d410e555656828e8892107add38ccb, Will
Schroeder, June 27, 2001:
https://github.com/InsightSoftwareConsortium/ITK/blob/699b66cb04d410e555656828e8892107add38ccb/Code/Common/itkMacro.h#L331-L337

Author: hjmjohnson

include/itkImageToPointSetFilter.h

@@ -50,7 +50,7 @@ class ITK_TEMPLATE_EXPORT ImageToPointSetFilter: public ImageToMeshFilter< TInpu
   itkNewMacro(Self);
 
   /** Run-time type information (and related methods). */
-  itkTypeMacro(ImageToPointSetFilter, ImageToMeshFilter);
+  itkOverrideGetNameOfClassMacro(ImageToPointSetFilter);
 
   /** Some convenient type alias. */
   using InputImageType = TInputImage;

include/itkMeshToPolyDataFilter.h

@@ -73,7 +73,7 @@ class MeshToPolyDataFilter: public ProcessObject
   using PolyDataType = PolyData< typename InputMeshType::PixelType >;
 
   /** Run-time type information. */
-  itkTypeMacro( MeshToPolyDataFilter, ProcessObject );
+  itkOverrideGetNameOfClassMacro( MeshToPolyDataFilter);
 
   /** Standard New macro. */
   itkNewMacro( Self );

include/itkPolyData.h

@@ -49,7 +49,7 @@ class ITK_TEMPLATE_EXPORT PolyData: public DataObject
   itkNewMacro(Self);
 
   /** Run-time type information (and related methods). */
-  itkTypeMacro(PolyData, DataObject);
+  itkOverrideGetNameOfClassMacro(PolyData);
 
   /** Type of PointData or CellData */
   using PixelType = TPixel;

include/itkPolyDataToMeshFilter.h

@@ -51,7 +51,7 @@ class PolyDataToMeshFilter : public ProcessObject
   itkNewMacro(Self);
 
   /** Run-time type information. */
-  itkTypeMacro(PolyDataToMeshFilter, ProcessObject);
+  itkOverrideGetNameOfClassMacro(PolyDataToMeshFilter);
 
   static constexpr unsigned int PointDimension = TInputPolyData::PointDimension;