cmark 0.24.1

• Commonmark renderer:
  • Use HTML comment, not two blank lines, to separate a list
    item from a following code block or list. This makes the
    output more portable, since the "two blank lines" rule is
    unique to CommonMark. Also, it allows us to break out of
    a sublist without breaking out of all levels of nesting.
  • is_autolink - handle case where link has no children,
    which previously caused a segfault.
  • Use 4-space indent for bullet lists, for increased portability.
  • Use 2-space + newline for line break for increased portability (#90).
  • Improved punctuation escaping. Previously all ) and
    . characters after digits were escaped; now they are
    only escaped if they are genuinely in a position where
    they'd cause a list item. This is achieved by changes in
    render.c: (a) renderer->begin_content is only set to
    false after a string of digits at the beginning of the
    line, and (b) we never break a line before a digit.
    Also, begin_content is properly initialized to true.
• Handle NULL root in consolidate_text_nodes.