eep, I'm worried about overly-generic catch-alls like this; with them we can no longer see things that have not been converted yet.

There is already a `data-*` prefixer at https://github.com/Connexions/rhaptos.cnxmlutils/blob/87146d40a5f5550a8a4b4e29ca03160dd33cde5d/rhaptos/cnxmlutils/xsl/cnxml-to-html5.xsl#L103 . maybe include `c:newline/@count|c:newline/@effect|c:space/@count|c:space/@effect` to the list? btw, attributes can contain newlines, I was just lazy