[w3c/WebPlatformWG] Promote BackButton MediaQuery to WICG (#128)

The [back button media query](https://github.com/fallaciousreasoning/backbutton-mediaquery/blob/master/explainer.md) is a proposal to allow [web applications](https://www.w3.org/TR/appmanifest/) to determine what UI controls are being displayed by the user agent.

This API is being proposed as a way to eliminate the "double back button" problem (seen [here](images/double-back-button.jpg), on Twitters PWA in the Microsoft store). This problem arises because developers of [`"standalone"`, `"fullscreen"`, and `"minimal-ui"`](https://www.w3.org/TR/appmanifest/#display-modes) apps have no way of determining whether a back button will be provided by the user agent (the browser, OS, or hardware) but are forced to implement their own, to ensure that their app is functional without the browser's UI.

Microsoft has expressed interest in experimenting with this API (@mustjab), so I'd like to move it to WICG and get some broader feedback. @marcoscaceres @aliams @hober do you have any thoughts?

There's a (newly opened) discourse thread [here](https://discourse.wicg.io/t/proposal-back-button-media-query/3802).





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