Separate out Leaderboard into BeatmapLeaderboard

osu.Game/Online/Leaderboards/MessagePlaceholder.cs

@@ -0,0 +1,26 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Framework.Graphics;
+using osu.Game.Graphics;
+
+namespace osu.Game.Online.Leaderboards
+{
+    public class MessagePlaceholder : Placeholder
+    {
+        private readonly string message;
+
+        public MessagePlaceholder(string message)
+        {
+            AddIcon(FontAwesome.fa_exclamation_circle, cp =>
+            {
+                cp.TextSize = TEXT_SIZE;
+                cp.Padding = new MarginPadding { Right = 10 };
+            });
+
+            AddText(this.message = message);
+        }
+
+        public override bool Equals(Placeholder other) => (other as MessagePlaceholder)?.message == message;
+    }
+}