Add build-scoped requests;

Add OnClick to TooltipIconButton; Actions on pressing previous/next in builds

osu.Game/Graphics/UserInterface/TooltipIconButton.cs

@@ -5,13 +5,16 @@ using OpenTK;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Cursor;
 using osu.Framework.Graphics.Shapes;
+using osu.Framework.Input;
 using osu.Game.Graphics.Containers;
+using System;
 
 namespace osu.Game.Graphics.UserInterface
 {
     public class TooltipIconButton : OsuClickableContainer, IHasTooltip
     {
         private readonly SpriteIcon icon;
+        public Action OnPressed;
 
         public FontAwesome Icon
         {
@@ -37,6 +40,12 @@ namespace osu.Game.Graphics.UserInterface
             };
         }
 
+        protected override bool OnClick(InputState state)
+        {
+            OnPressed?.Invoke();
+            return base.OnClick(state);
+        }
+
         public string TooltipText { get; set; }
     }
 }