[w3c/permissions] Rename PermissionName enum to PowerfulFeatureName (#286)

The `PermissionName` is a misnomer - it actually identifies "powerful features" for which a permission status can be queries. 

To bring some sanity, I'm renaming `PermissionName` enum to `PowerfulFeatureName`.


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<a href="https://pr-preview.s3.amazonaws.com/w3c/permissions/pull/286.html" title="Last updated on Aug 31, 2021, 5:43 AM UTC (d69bab7)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/permissions/286/a8d8549...d69bab7.html" title="Last updated on Aug 31, 2021, 5:43 AM UTC (d69bab7)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/permissions/pull/286

-- Commit Summary --

  * Rename PermissionName enum to PowerfulFeatureName

-- File Changes --

    M index.html (48)

-- Patch Links --

https://github.com/w3c/permissions/pull/286.patch
https://github.com/w3c/permissions/pull/286.diff

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