[heycam/webidl] Stop claiming callback interfaces are interfaces (#705)

Callback interfaces and interfaces have very little in common, so this makes
them separate concepts. It doesn't change the name or syntax to avoid
unhelpful churn.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/705

-- Commit Summary --

  * Stop claiming callback interfaces are interfaces

-- File Changes --

    M index.bs (419)

-- Patch Links --

https://github.com/heycam/webidl/pull/705.patch
https://github.com/heycam/webidl/pull/705.diff

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