fixes #22091

team work with @isidorn

Move shared process to a browser window

proposal to fix issue 21600

fixes #21655

fixes #22118

**Bug**
The markdown grammar for fenced code blocks is rather unmaintainable since it involves lots of copy and pasted code

**Fix**
Use a gulp task and a template to generate the fenced code block grammars include directly. This allows adding new language support much more easily.

see #9513