Re: [w3c/manifest] Update manifest spec to consider manifest updates for icon urls to be cache-control:immutable (PR #1199)

@dmurph commented on this pull request.



> @@ -1792,6 +1792,13 @@ <h3>
             `name_localized`.
             </li>
           </ol>
+          <p>

Spec is binding, and our implementation also considers icons if any of them change. 

perhaps something like:

```
The user agent SHOULD consider a [=manifest image resource=] updated if the {{ImageResource/src}} member has changed. If the {{ImageResource/src}} has not changed, the user agent MAY download the image and check for visual differences in some cases, like when other [=manifest image resources=] have changed.
```

And then in the later paragraph, we need to call out that security sensitive memger change

```
User agents SHOULD NOT automatically apply changes to
            [=security-sensitive members=] without [=express permission=] from
            the user. User agents MAY consider an icon unchanged if the user agent determines the visual difference is insignificant.
```

IDK if we need to mention cache-control immutable

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