Add Comic Relief as metric alias for Comic Sans MS.

Comic Relief is a metrically equivalent replacement for the popular Comic Sans MS font. It was released under the SIL Open Font License.

More at http://loudifier.com/comic-relief-1-0-is-officially-out/. Sources available at http://loudifier.com/wp-content/uploads/2019/01/ComicRelief-source.zip.

Available for download on many other "font websites", the author recommends https://fontlibrary.org/en/font/comic-relief.