* Adds command to post a message to an html preview

**Bug**
There is currently no easy way to communicate with an html preview document after the preview has been created.

**Fix**
Adds a command called `vscode.htmlPreview.postMessage` to post a message to a visible html preview. This message will only be posted if the target preview is visible.

Inside the preview, the event is recieved using the standard dom event:

* Remove logging

* proto

Continue proto

* clean up rendering

* Gate prototype

* Fix gating

* Remove public command

* Change setting name

* Added current position indicator

* Reveal center

* proto

Continue proto

* Basic implementation

Node defaults to a limit of 1.7gb apparently, this causes issues particularly
on Windows where it's easy to hit this limit. This change rolls the limit
adjustment into npm run watch and npm run compile.

Fixes #7108

- Extend search across left and right editors
- Show tabs inside settings editor to show user and workspace settings
- Improve highlighting of settings

Added a link to disable an extension doc

This should fix the last major issues with applications within WSL

Part of #13625

Allow extensions to handle launching of the debug adapter

fixes #18669

Adds support for moving the tab close button to the left

Allow Expanding Suggestions with Mulitline details