[w3c/manifest] Fix(processing): treat enums as case insensitive (#462)

 * display, orientation, and dir are now case insensitive
 * values are normalized to lower-case on return
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/462

-- Commit Summary --

  * Fix(processing): treat enums as case insensitive

-- File Changes --

    M index.html (32)

-- Patch Links --

https://github.com/w3c/manifest/pull/462.patch
https://github.com/w3c/manifest/pull/462.diff

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