[w3c/manifest] Single-window mode option (#597)

We're looking into installable apps on Desktop platforms (in Chrome) and have identified two different types of app (at least):

- Multi-window: Feels like the default since it's closest to the web model. Links to the app create a new app window. Launching the app opens a new window.
- Single-window: Only ever has a single instance. Links to the app perhaps just focus and navigate the existing app window. Launching the app focuses the existing window.

On Mobile, we effectively have the single-window version (that mirrors how native apps tend to work on Mobile). But on Desktop, it seems that multi-window should be the default, but apps may still wish to opt in to single window.

How do we feel about adding a Boolean property in the manifest to force a single instance?

This is just a discussion point. We are considering alternatives to this (which I will post here soon).

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