Sports has always been a good subject for motion pictures, and baseball has certainly been at the top of the list. And that’s not only for the excitement of the game, but often for the sentimentality involved as well.“Pride of the Yankees,” the Lou Gehrig story starring Gary Cooper, tracked his courageous final years suffering from ALS, the excruciating illness that now bears his name. In “Bang the Drum Slowly,” a pitcher (Michael Moriarty) bonds with his cancer-stricken catcher, portrayed by …