Unnecessary. That’s the inescapable word that plagues “Pan” throughout its hefty 111 minute running time. It saddles the impish, carefree character of J M Barrie’s timeless tale with a hackneyed chosen one narrative so crushingly unsubtle that the characters actually use the phrase ‘chosen one’ near constantly. Abandoned on the steps of an orphanage as a baby, Peter is left in the none-too-tender…