[w3c/gamepad] Switch from WebIDL arrays to FrozenArray<>s in the IDLs. (#62)

Arrays have not existed in the WebIDL spec since 2015, so the Gamepad
spec (as well as the accompanying Gamepad Extensions one) were providing
invalid IDL definitions.

Switch to FrozenArray<T> and clarify in prose that some attributes should be
cached by the user agent until new values have to be returned.

Fixes #28.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/gamepad/pull/62

-- Commit Summary --

  * Switch from WebIDL arrays to FrozenArray<>s in the IDLs.

-- File Changes --

    M extensions.html (6)
    M index.html (7)

-- Patch Links --

https://github.com/w3c/gamepad/pull/62.patch
https://github.com/w3c/gamepad/pull/62.diff

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