Quarto compatibility

[RegisGourdel]

Hi, first thanks a lot for your work on this extension, it is the one thing that allows my VS code to still be more competitive than other solutions for LaTeX.

Is your feature request related to a problem? Please describe.
No.

Describe the solution you'd like
Quarto documents have a specific file extension, qmd, meaning that it's not natively treated by LTEX at the moment. But the compatibility would make a lot of sense, and the parsing would probably be almost the same as for markdown files.

Describe alternatives you've considered
Two non-optimal solutions:

1. Exporting the file tex file (in the process of exporting to pdf), browsing through the tex file with LTeX to find mistakes, and correcting in the original qmd file.
2. Telling VS code to consider the original file as markdown, but then it has some syntax issues in particular with the yaml, and it needs to be changed back.

Additional context
So, Quarto is a recent pandoc-based solution that is very much between markdown and latex in terms of both syntax of capabilities, with easy conversion to both.
It's gaining popularity and I'm replacing some of my tex documents by this because it runs very nicely.

[sondalex]

Hi, I have proposed a feature a draft PR few months ago #172 . I put this message here for anyone who would like to build on this draft and eventually enable [flexmark-java extension] (https://github.com/vsch/flexmark-java) in order to take care of pandoc's markdown special cases.

[valentjn]

Fixed via #172, thanks for the PR.

[github-actions]

This issue is now fixed on develop. The fix will be included in the next release of LT_EX.

If you don't want to wait, you can try out the nightly pre-release tomorrow. Nightly pre-releases are published every morning at around 4am UTC.