Support inline markdown

[scarf005]

markdowns used alongside a lot with HTML. supporting them would be useful for blog generators.

Alternatives

I've been using https://marketplace.visualstudio.com/items?itemName=jeoht.es6-string-markdown, however there's caveats:

• repository is gone
• it does not work properly with indented markdowns

  
  const text = /*md*/`
  # This heading is not highlighted

This heading is correctly highlighted

`

[pushqrdx]

@scarf005 this is a problem with how vscode itself handles markdown, if you test in a new markdown file, indented headings will not be highlighted, this is the reason I didn't add markdown to inline html, plus other annoyances where code blocks in markdown will clash with es6 backtick ``` character. I'll leave this issue open so that maybe someday I find a clean workaround to integrate markdown into inline html