[w3c/manifest] Expose API for managing Web App aspects (#472)

It would be nice to have some kind of API for inspecting, and perhaps updating, aspects relating to the  web application: that is, an API that reflects the values of the manifest - or perhaps even allows the manifest to not exist at all. 

Ideally, this API would live in a service worker - and would act as the "source of truth" for the web application. The current manifest format could serve as way of populating the web app's defaults - but those could be access and updated via this API. 

One could then access things like the start_url, the icons, etc.

@annevk, would you like to elaborate on some use case, ideas, model, etc.? 

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