WinJS and ES6 Promises

- avoid public modifier
- use Disposable where applicable
- fix some event handler leaks
- clean up some TODO@ben

Fixes #52967

Needed to understand which type of refactorings are most used so we can decided which bugs to prioritize and which new refactoring areas to invest in

* Enfoce node boundries in places where it matters

* Flip defualt emmet includeBoundries to true

Explicitly set getNode's include boundries where needed

* Remove defualt papameter

* Add update image boundry tests

* Add tests for bondries on some of the tag actions

* Rest of tag tests

Handle --enable-proposed-api without extension IDs as "enable all"