Scores of gangbangers marauded through Times Square and nearby streets last night, storming businesses and harrassing pedestrians as three people were shot in possibly related violence. Hundreds of cops struggled to disperse the youths. One man was shot in the ankle on West 41st Street between Seventh and Eighth avenues. Early this morning two people were shot at 34th Street between Seventh and Eighth avenues. Their conditions were not immediately known. Twenty young men were seen fleeing the scene. * * * At least 30 people, including seven juveniles, were arrested by early this morning. In past years, the NYPD...