[heycam/webidl] Everything is a module (#676)

#675 reminded me of an idea by @lukewagner that everything should be a module, somehow, so it'd be easier to use from WebAssembly. If that came to pass we'd probably need more granular `[SecureContext]` and `[Exposed]` annotations.

It might also make sens that inside a module we'd use `[AvailableIn]` rather than `[Exposed]` so that the latter can be reserved for truly exposing something on a global, whereas `[AvailableIn]` (bikeshedding welcome) would indicate where it's functional. E.g.,
```webidl
[AvailableIn=Window]
module dom {
  [Exposed=Window]
  interface Node { ... };

  ...
};
```

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