[whatwg/dom] Undeprecate document.all (Issue #1196)

I recently discovered `document.all` in an effort to find more direct ways of referencing elements with an id attribute, like `window.myElementId` apparently works. 

Anyway, I was disappointed to read that `document.all` is deprecated (https://developer.mozilla.org/en-US/docs/Web/API/Document/all) despite being supported by all current versions of major browsers.

I'm not sure of any costs or legitimate issues with using `document.all`, but the DX is awesome:
```
<span id="welcomeMessage" hidden>Welcome!</span>

document.all.welcomeMessage.hidden = false;
document.getElementById('welcomeMessage').hidden = false;
```
What's the harm with un-deprecating this property?

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