Closing tag names include trailing whitespace

[AngusMorton]

The following HTML/Marko doesn't parse because the closeTagName is parsed with whitespace and so the open and close tag names don't match.

<span class="dolorum atque aspernatur"
  >Est molestiae sunt facilis qui rem.</span
>

<span class="dolorum atque aspernatur"
  >Est molestiae sunt facilis qui rem.</span
                                        ^^^^ 
       The closing "span\n" tag does not match the corresponding opening "span" tag.
>

I would expect the closeTagName to be "span" and the closeTagEnd to be "\n>"... But I don't know if that makes sense. Alternatively, we consume and discard the whitespace between closeTagName and closeTagEnd. I also don't know how this change would impact upstream dependencies.