[w3c/manifest] Define an algorithm for launching web app (PR #1056)

This is in service of: https://github.com/WICG/web-app-launch/issues/67

This change (choose at least one, delete ones that don't apply):

* Makes editorial changes (changes informative sections, or changes normative sections without changing behavior)

Commit message:

This change adds an algorithm for launching a web app to be used by manifest features that invoke launches like shortcut items, share target, file handling etc. This is also intended to be a point for https://wicg.github.io/web-app-launch/#launching-a-web-app to replace the behaviour with something that can re-use existing web app instances.

Person merging, please make sure that commits are squashed with one of the following as a commit message prefix:

* chore:
* editorial:
* BREAKING CHANGE:
* And use none if it's a normative change

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/1056

-- Commit Summary --

  * Branch: launch-web-app
  * Fix refs

-- File Changes --

    M index.html (48)

-- Patch Links --

https://github.com/w3c/manifest/pull/1056.patch
https://github.com/w3c/manifest/pull/1056.diff

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