Differentiate between indented and fenced code block in the AST

[mojavelinux]

It would be helpful when converting to other output formats if the parser added information to the AST to differentiate between an indented codeblock and a fenced codeblock. The use of these two forms often imply a different meaning (esp when both occur in the same document). At the moment, these two block types are indistinguishable in the AST.

I'm proposing a hint such as fenced: true in the options map for the parsed element (in the parse_codeblock_fenced method)

I'd be happy to provide a PR if this idea receives approval.

[gettalong]

Thanks for this proposal - I'm okay with adding such a hint. And would gladly accept a PR 😄 👍

[mojavelinux]

Fantastic! Thanks Thomas.

[gettalong]

Thanks for your pull request - I have cherry-picked it.

[mojavelinux]

Thanks @gettalong!