Add beatmap set online status and display it in direct panels and the beatmap set overlay.

osu.Game/Beatmaps/BeatmapSetOnlineInfo.cs

@@ -26,6 +26,11 @@ namespace osu.Game.Beatmaps
         /// </summary>
         public DateTimeOffset? LastUpdated { get; set; }
 
+        /// <summary>
+        /// The status of this beatmap set.
+        /// </summary>
+        public BeatmapSetOnlineStatus Status { get; set; }
+
         /// <summary>
         /// Whether or not this beatmap set has a background video.
         /// </summary>