This reverts commit 67e6aef0.

This reverts commit 5a0ab960.

* Remove scheme restriction for Markdown/Emmet

* Explicitly marking scheme support

This reverts commit c25e395a.

This reverts commit d60b16c82e3ab83d6b1f2787a176d5a2e38b829b.

Replaces many loops of the form:

```js
for (let i = 0; i < elements.length; ++i) {
    const i = elements[i];
   ...
}
```

with:

```js
for (const element of elements) {
    ...
}
```

Mix of a horrible regex based find/replace and manual touch ups

* fix

* fixed typo

* Formatting