Apple has released its picks for best apps of 2015. The company picked Periscope (our runner up for App of the Year) as its iPhone App of the Year — calling it a game-changer that “made sharing and watching live videos an instant obsession” — and selected photo editor Enlight and stock-trading app Robinhood as its runners-up. Workflow won Most Innovative app for iPhone, and Instagram’s 3D Touch enhancements won it Best App on…