* Remove scheme restriction for Markdown/Emmet

* Explicitly marking scheme support

This reverts commit c25e395a.

This reverts commit d60b16c82e3ab83d6b1f2787a176d5a2e38b829b.

it should avoid to have "warning XXX: No license field" during yarn
build
Signed-off-by: NAurélien Pupier <apupier@redhat.com>

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