Support varargs in JSO objects

[Ihromant]

Example:

public interface DOMTokenList extends JSObject {
        void add(String... tokens);
        void remove(String... tokens);
}

After it #867 can be merged.

[konsoletyper]

What if I implement it in 10 years? Should mentioned PR wait 10 years then?

[Ihromant]

Definitely no. I will try to investigate and implement it myself. Will ask questions if something.