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/itkFDFImageIO.h

@@ -45,7 +45,7 @@ class IOFDF_EXPORT FDFImageIO : public ImageIOBase
   itkNewMacro(Self);
 
   /** Run-time type information (and related methods). */
-  itkTypeMacro(FDFImageIO, ImageIOBase);
+  itkOverrideGetNameOfClassMacro(FDFImageIO);
 
   bool
   SupportsDimension(unsigned long dim) override

include/itkFDFImageIOFactory.h

@@ -48,7 +48,7 @@ class IOFDF_EXPORT FDFImageIOFactory : public ObjectFactoryBase
   itkFactorylessNewMacro(Self);
 
   /** Run-time type information (and related methods). */
-  itkTypeMacro(FDFImageIOFactory, ObjectFactoryBase);
+  itkOverrideGetNameOfClassMacro(FDFImageIOFactory);
 
   /** Register one factory of this type  */
   static void