Re: [w3c/manifest] Use case for appuninstall event (#636)

This just came up in a discussion with @surma:

1.) Install [Twitter PWA](https://mobile.twitter.com/) (as a WebAPK).
2.) Use it, activate push notifications, etc.
3.) Uninstall Twitter PWA.
4.) Continue to get push notifications.

While notification permission and Service Worker installation are orthogonal, especially in the case of WebAPKs it feels unintended that one would continue to receive notifications. 

Probably it would make sense to combine [default behavior described above](https://github.com/w3c/manifest/issues/636#issuecomment-357833432) by @marcoscaceres with customizable cleanup (or maybe tracking?) actions. 

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