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

fixes #21683

Adds specific messages when `go to implementation` or `go to type definition` returns no results.

Fix #21158. DND doesnt shrink selection if no dnd happens, DND doesnt show affordance inside original selection'

fixes #22049