Update for constructor operation support

[Ms2ger]

Probably just needs plinss/widlparser#44 to be imported.

[plinss]

widlparser has been updated.

Note that extended attribute constructors are exposed by the 'constructors' property, but constructor operations are not, they're just regular methods. Both are exposed by the 'members' property but constructor operations have a 'method' idlType while the [Constructor] and [NamedConstructor] attributes have a 'constructor' idlType.

Let me know if this is going to be an issue for bikeshed, but it was necessary to differentiate them within widlparser.

[foolip]

Sent #1514 if anyone has the power to review.

[birtles]

It seems like this doesn't linkify constructor? (Unlike [Constructor] which was link-ified.) And it doesn't correctly linkify the arguments of the constructor either with constructor scope?

Is that right, or am I just doing it wrong?

[foolip]

That's right, see #1519.

[birtles]

Thank you!