Kevin SPacey, two-time Oscar-winning actor and star of one of the most talked-about online streaming shows “House of Cards,” leans forward and says that even in his lofty status among Hollywood actors, he still has a personal point to prove. With new documentary “Now: In the Wings on a World Stage,” Spacey lets his personal passion for theater roar in a film that introduces audiences to his second career on the stage as he tours the world with his own company’s production of William Shakespeare’s historical play “Richard III.”