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/itkLabelSetDilateImageFilter.h

@@ -52,7 +52,7 @@ class ITK_EXPORT LabelSetDilateImageFilter : public LabelSetMorphBaseImageFilter
   itkNewMacro(Self);
 
   /** Runtime information support. */
-  itkTypeMacro(LabelSetDilateImageFilter, LabelSetMorphBaseImageFilter);
+  itkOverrideGetNameOfClassMacro(LabelSetDilateImageFilter);
 
   /** Pixel Type of the input image */
   using InputImageType = TInputImage;

include/itkLabelSetErodeImageFilter.h

@@ -54,7 +54,7 @@ class ITK_EXPORT LabelSetErodeImageFilter : public LabelSetMorphBaseImageFilter<
   itkNewMacro(Self);
 
   /** Runtime information support. */
-  itkTypeMacro(LabelSetErodeImageFilter, LabelSetMorphBaseImageFilter);
+  itkOverrideGetNameOfClassMacro(LabelSetErodeImageFilter);
 
   /** Pixel Type of the input image */
   using InputImageType = TInputImage;

include/itkLabelSetMorphBaseImageFilter.h

@@ -58,7 +58,7 @@ class ITK_EXPORT LabelSetMorphBaseImageFilter : public ImageToImageFilter<TInput
   itkNewMacro(Self);
 
   /** Runtime information support. */
-  itkTypeMacro(LabelSetMorphBaseImageFilter, ImageToImageFilter);
+  itkOverrideGetNameOfClassMacro(LabelSetMorphBaseImageFilter);
 
   /** Pixel Type of the input image */
   using InputImageType = TInputImage;