Re: [manifest] Allow developers to detect when the user has added the site to their home screen (or equivalent) (#417)

If there is no prompt, there is no `beforeinstallprompt` event but there is an `install` event.

Regarding `uninstall`, I'm not sure this event makes a lot of sense: would you open the web app to tell it has been uninstalled? (FWIW, Chrome wouldn't be able to implement this.)

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