Playlab go to xy

Necessary for animation in MSM (particularly quadratic motion and nonlinear acceleration). I don’t expect this
block to be used directly by students (at least not in any of our
current courses).
either way is probably fine (how you have it now, or just always using the > 1 case). I'd just change it to use a new msg.moveSpriteNTo (that will get localized) and then get rid of the unlocalized to.