Re: [manifest] Add meta tags equivs. for features were possible (#350)

We currently define:

 * `short_name` === `meta@name=application-title`
 * `name` === `<title>` 
 * `icons` === `link@rel=icons`
 * `theme_color` === `meta@name=theme-color`

Currently missing HTML `meta` equivs. for:

* `display` 
* `orientation`
* `start_url` 
* `lang` - could grab `HTMLHTMLElement.lang`? 
* `scope`

Thoughts on the above? 


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https://github.com/w3c/manifest/issues/350#issuecomment-90257382