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Forget ‘‘Mad Men’’ modernism. This season’s style is all about the Edwardian opulence of ‘‘Downton Abbey.” Millions around the world have been seduced by the strait-laced but stylish world of the British historical drama. Soon they’ll be able to take some of that style home, getting lips as soft as Lady Mary’s, wine inspired by Lord Grantham’s favorite tipple, and even walls as gray as Mrs. Patmore’s kitchen. Since it premiered in 2010, the series about the family and servants of a grand English house in the 1910s and 1920s has become a television juggernaut, sold to 220 territories around the world. The program’s makers have arguably been slow to exploit the commercial potential of that popularity through merchandising, selling little more than DVD sets, wall calendars, and desk diaries. But that is about to change.