WEST PALM BEACH, Fla. — In the past two years the young British choreographer Liam Scarlett has achieved the status of an important classical-ballet choreographer. The images, constructions and textures of “Viscera,” his new creation for Miami City Ballet, show why. I watched it with three different casts over the weekend at the Kravis Center for the Performing Arts here. Each time the audience proclaimed its excitement the moment it ended. That’s a natural response to the terrific control of physical energy in its elaborate finale; but in terms of architectural organization too, this is an impressive piece.