“Masterpiece on PBS” series “Sanditon” has rounded out its cast for Seasons 2 and 3 — the ones without fan-favorite Theo James.Don’t feel too badly for Charlotte Heywood (Rose Williams), however, she has two new love interests in mysterious Sanditon resident Alexander Colbourne (Ben Lloyd-Hughes) and war hero Colonel Francis Lennox (Tom Weston-Jones).Williams, Crystal Clarke, Anne Reid, Turlough Convery, Charlotte Spencer, Kris Marshall and Kate Ashfield are newcomers Lloyd-Hughes, Weston-Jones,