We compile using alwaysStrict so this directive is not needed

* Allow css emmet completions when abbr contains period Fixes #44352

* Move css related workaround to cssMode #44352

* getEmbeddedParsedDocument is now not needed

* Show emmet completions everywhere inside the embedded css doc

* Get emmet completions from html,css extensions

* Resolve extensionsPath, use emmet results even if empty

* Support css abbr with :

* Refactoring

* Add some basic emmet tests

* Refactoring

* More tests

Moves the html extension's client code to strict mode and also updates some of the server code. The rest of this migration will requires changes to the *.d.ts files that the server consumes