Introduce wollok.lang.Closure

[javierfernandes]

I believe that this requires either having many classes like Closure0, Closure1, Closure2, Closure3.. .etc.. for different numbers of parameters, either supporting varargs for the "apply method"

method apply(arguments...) {
}

[npasserini]

I like the varargs!

[javierfernandes]

Varargs already implemented in #371 Now we just need to model the wollok.lang.Closure and remove the 100% native class and refactor the whole interpreter

[javierfernandes]

Done !

For the moment, it just has this

    /**
     * @author jfernandes
     * @since 1.3
     * @noInstantiate
     */
    class Closure {
        method apply(parameters...) native
        method toString() native
    }