Create a visualize helper function

[exoticDFT]

Create a "visualize" helper function that passes the scenes to visualize, a timestep in which the scenes were generated and any mapping from Entity.id to Carla id if necessary. Something like

visualize(scenes:` List, timestep: double, entity_map: Dict{Any, Int})
    for i = 1 : length(scenes)
        start_time = Now()
        scene = scenes[i]
        update_world(carla_world, scene, entity_map, handiness)
        sleep(start_time + timestep - Now())
   end