KEITH COFFMAN TWO of three teenage boys will be tried as adults for charges of murder and arson in a Denver house fire that killed five Senegalese immigrants, including two young children, prosecutors revealed yesterday. Kevin Bui and Gavin Seymour, both 16, are charged with five dozen counts of murder, arson, conspiracy, attempted murder and related offenses stemming from the deadly blaze on Aug. 5, 2020, Denver District Attorney Beth McCann said in a written statement. The third suspect, a 15-year-old boy whose name has been kept under seal because he is a minor, is charged in juvenile court with…