Adopt MF2 prefixed properties

[dshanske]

As has become a 'standard' in the Indieweb community, microformats2 properties use the name of the property prefixed by mf2.

That means 'semantic_linkbacks_avatar' should be changed to mf2_photo or a nested property of mf2_author->photo.

Type, as discussed, probably should be moved to the comment_type box. But otherwise, the relevant property... like-of, in-reply-to, etc. Which the new version of Semantic Linkbacks already stores.

'semantic_linkbacks_canonical' should move to mf2_url.

Backcompat can be achieved by adding a filter to get_comment_meta to retrieve the new property if someone asks for the old one and it isn't there.

[dshanske]

function get_semantic_linkbacks_comment_meta( $value, $comment_ID, $meta_key, $single ) {
 if ( 'semantic_linkbacks_canonical' == $meta_key ) {
                  return get_comment_meta( $comment_ID, 'mf2_url', $single );
           }
  
          return null;
 }
 
 add_filter( 'get_comment_metadata', 'get_semantic_linkbacks_comment_meta', 10, 4 );

This should be the easiest solution for backcompat. Start storing in the new location, and if anyone asks for the old info, give them the new one.

[stale]

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