[webidl] Allow constructor<ClassType> as a type accepted by functions. (#101)

From personal email, which I never got around to filing here :)

Something like:
```
[Constructor]
callback interface Painter {
  static sequence<DOMString> inputProperties;
  void paint(Blah blah);
};

interface PaintWorkletGlobalScope … {
  void registerPaint(DOMString name, constructor<Painter> paintCtor);
};
```

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https://github.com/heycam/webidl/issues/101