* Webview api
* Cleaning up markdown webview
* Hooking up dispose
* Fix some merge errors
* Use custom context key to show markdown title bar contributions
* Add basic on focus and on blur events
* Fixing find widget in webview
* Hookup _isDisposed
* Use new extension resource scheme to load markdown extension resources
* Documenting keep alive
Fixes#8488
**Bug**
Currently there is no indication in the markdown preview when a `markdown.styles` element fails to load
**Fix**
Show an alert then a stylesheet does not load