[heycam/webidl] Interaction of extended attributes and typedefs is weird (#649)

Consider this IDL:
```
    typedef [Clamp] long ClampedLong;

    interface Bar {
      void func(ClampedLong arg);
    };
```
Is this valid IDL?  Per https://heycam.github.io/webidl/#idl-type-extended-attribute-associated-with step 6, the extended attributes "associated with" `ClampedLong` include `[Clamp]`.  But https://heycam.github.io/webidl/#Clamp says:

> A type that is not an integer type must not be associated with the [Clamp] extended attribute.

and `ClampedLong` is not an "integer type" in the sense linked here, as far as I can tell...

Presumably the intent is to allow this, right?  That should be made clearer.

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