Remove deprecated void support

[nektro]

https://github.com/w3c/webidl2.js/blob/83fffdb/test/invalid/idl/void-keyword.webidl#L1-L4

removed here whatwg/webidl#906

[saschanaz]

Hmm? That's literally "invalid" idl 👀

[saschanaz]

But it's true that it's overdue of this void thing, I'll remove the void support completely. I don't think that specific test will change, though.

[nektro]

right but since void isnt a keyword anymore its validly parsed as an identifier (granted one that doesnt match to anything, but that would only be found out at a later step) (i suppose the validator here could be doing that but mine wasn't which is what led to the confusion)

Definitions
Definition
CallbackOrInterfaceOrMixin
InterfaceOrMixin
InterfaceRest
InterfaceMembers
InterfaceMember
PartialInterfaceMember
Operation
RegularOperation
Type
SingleType
DistinguishableType
identifier

[nektro]

similar to how the following passes on https://w3c.github.io/webidl2.js/checker/

[Exposed=Window]
interface Foo {
  Bar foo();
};

[saschanaz]

Oh right, yes. Good point, thank you.