Re: [w3c/manifest] Additional property to define a webapp to be single instance (single-tab) (#479)

After doing some reading I think this isn't possible currently with SWs, but the pieces are almost there:
- SWs can intervene in network fetching via the fetch event, but not with navigation itself
- SWs can use Clients.openWindow to open existing windows, however that is currently only allowed in response to a notification click event.

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