Shake down the thunder from the sky! Here comes the musical “Something in the Game,” an unabashed love song to Knute Rockne, football, the Fighting Irish and the University of Notre Dame.It took more than 10 years since its debut at Munster, Ind.’s Theater at the Center in 2008 for the play to come to Northwestern University’s American Music Theatre Project at the Wirtz Center for the Performing Arts …