Add TheTVDB.com Cinemagraph support

[Killface69 96]

As the title says, I discovered that thetvdb.com also has cinemagraphs on selected titles, for backgrounds.

See https://www.thetvdb.com/series/the-mandalorian#artwork-cinemagraphs or https://www.thetvdb.com/series/game-of-thrones#artwork-cinemagraphs as reference.

I'd love to see those integrated in the shows, and maybe movies section. I used to have TV show intros in the backdrop folder, but found them too distracting, thus I'd like to try cinemagraphs  
Maybe it's possible to add them as a sscraping option?

[Luke 42077]

Hi, yes those look very neat.