[heycam/webidl] [WIP] Add mixins (#433)

This is an early peek. Still a number of things to figure out, but though some of you would be interested to check it out already.

As I mentioned on IRC, I feel like the mental model I'm using for mixins is that they're named interface partials that can extend more than one interface with a limited set of members.

Not asking for a review right now, but high-level issues/comments welcomed.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/433

-- Commit Summary --

  * Update NIO advisement
  * Unrelated WS
  * Add initial Mixins and Members sections
  * Add mixins

-- File Changes --

    M index.bs (1077)

-- Patch Links --

https://github.com/heycam/webidl/pull/433.patch
https://github.com/heycam/webidl/pull/433.diff

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