[heycam/webidl] Stop using extended attributes for constructors (#636)

There has been some discussion about this in #485; I'm filing this to consider changing `[Constructor]` in particular, since nobody seemed to particularly object to it.

I'd like to propose the following syntax:

```webidl
interface Foo {
  constructor(...);
};
```

Without further changes, I believe the only WebIDL-defined extended attributes that would potentially start applying are `[Exposed]`, `[SecureContext]` and `[Unforgeable]`. It seems fine to allow `[Exposed]` and `[SecureContext]`, but I would disallow `[Unforgeable]`.

We should probably not allow constructors to be specified within mixins.

Please comment asap if you have thoughts on this.

CC @yuki3 @littledan @bzbarsky @tabatkins @domenic @annevk 

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