This fixes unintentional duplications of words, such as `the the`, and
`can can` etc. I also take the chance to make a few wording tweaks to
avoid suspicious duplications.

We compile using the alwaysStrict flag so these directives are not needed

This part removes most `use strict` directives that are right after the file header

There are many places in the code that do `import Event, { ...} from '.../event'`.

* adopt the classifier;

Fix horizontal revealing of a range (in the smooth scrolling case where the line containing the range might come in the viewport at a later time)

* use `dom.scheduleAtNextAnimationFrame`

* have explicit methods for changing the scroll position (delayed/smooth vs now/direct) that bubble up to the editor internals.
* have all other clients of ScrollableElement not use smooth scrolling

Do not use translate3d in scrollbars, use will-change for scrollbar sliders instead (Microsoft/monaco-editor#426)

* Fix horizontal scrolling when shift is held

Fixes #24710

* Improve comment

 * Apply smooth scrolling in every scrollable element when mouse wheel scroll
   occurs

 * Apply smooth scrolling in editor view when large jumps occur
   (e.g. when the cursor is moved by pressing PageUp or PageDown)

fixes #21001