The player module plays Blinken movies from a playlist.
      The configuration of the player module with name NAME
      is located in the players/NAME subdirectory.
    
      The playlist contains all movies in the subdirectory
      playlist.
      The movies are played in alphanumerical order.
    
      The file outstream contains the name of the stream to
      send the frames to.
    
      The player can be halted whenever another stream is active.
      Therefore, the name of the other stream is written to the file
      haltstream.
      When the halt stream becoms active, the current frame is frozen,
      i.e. the frame is kept.
      When the halt stream ends, the player resumes with the remaining
      time for the current frame and continues as usual afterwards.
      
      If this feature is not needed, the file haltstream
      should not exist.