Re: [heycam/webidl] Add [InNamespace] to allow defining an interface in a namespace (#425)

The main issue for me is that this would disallow the following fragment since the interface name is the same (or at least I think, I cannot find the clause that disallows this but it seems reasonably logical):

```webidl
[Exposed=Window]
interface Foo {};

[Exposed=Window]
namespace bar {};
[InNamespace=bar]
interface Foo {};
```

... and namespacing was kind of the point of namespaces.

On the other hand, even if we do allow that, it can be difficult (for a human) to immediately recognize `Foo` was not indeed exposed globally but through a namespace.

I agree that a syntax change can cause churn, no doubt about that, but I still believe it's the best way forward.

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