By Matt Hladik Today is a big day for former NFL quarterback Quincy Carter. The 44-year-old former Cowboys and Jets signal caller is celebrating his third anniversary being sober. Carter has been open in the past about his battle with alcohol, marijuana and cocaine addictions. Fortunately, he has turned his life around and is keeping on a healthy and clean path. The sports world is rightfully celebrating Carter’s progress and his milestone on Wednesday. A Decatur, Georgia native, Carter starred at Southwest DeKalb High School and the University of Georgia before being drafted by the Cowboys in…