HBO is officially confirming the first cast members for the “Harry Potter” TV series. The cast now includes the following series regulars: John Lithgow (“Conclave,” “The Crown”) as Albus Dumbledore, Janet McTeer (“Tumbleweeds,” “The White Queen”) as Minerva McGonagall, Paapa Essiedu (“I May Destroy You,” “Gangs of London”) as Severus Snape, and Nick Frost (“Shaun […]