Add Tuple.function[N](Function<? super Tuple[N]<T1, ..., TN>, ? extends R>

[lukaseder]

This is the inverse operation for #214

interface Tuple {
    static Consumer2<T1, T2> consumer2(Consumer<? super Tuple2<T1, T2>> consumer);
    static <R> Function2<T1, T2, R> function2(Function<? super Tuple2<T1, T2>, ? extends R> function);
}

A lot of methods would be generated this way. Perhaps we should wait with the implementation to see if this is really needed.

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See also: #214 (comment)