[w3c/manifest] auto value of the dir member (#923)

https://www.w3.org/TR/appmanifest/#dom-textdirectiontype-auto

AFAIK the `auto` value for direction is often used when the direction is to be determined programmatically using heuristics. See [HTML](https://html.spec.whatwg.org/multipage/dom.html#the-dir-attribute) for an example.

For specs that don't use heuristics to determine the base direction (like [CSS](https://drafts.csswg.org/css-writing-modes-3/#direction) and [TTML](https://www.w3.org/TR/ttml2/#style-attribute-direction)), they usually don't include an `auto` value. I wonder what intention of the `auto` value is in the Web App Manifest. Is an `auto` value needed?

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