Add basic tweening mouse cursor.

# Conflicts:
#	osu-framework

osu.Game/Graphics/Cursor/OsuCursorContainer.cs

@@ -0,0 +1,53 @@
+//Copyright (c) 2007-2016 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.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Cursor;
+using osu.Framework.Graphics.Sprites;
+using osu.Framework.Graphics.Transformations;
+using osu.Framework.Input;
+
+namespace osu.Game.Graphics.Cursor
+{
+    class OsuCursorContainer : CursorContainer
+    {
+        protected override Drawable CreateCursor() => new OsuCursor();
+
+        protected override bool OnMouseDown(InputState state, MouseDownEventArgs args)
+        {
+            ActiveCursor.Scale = new OpenTK.Vector2(1);
+            ActiveCursor.ScaleTo(1.2f, 100, EasingTypes.OutQuad);
+            return base.OnMouseDown(state, args);
+        }
+
+        protected override bool OnMouseUp(InputState state, MouseUpEventArgs args)
+        {
+            if (!state.Mouse.HasMainButtonPressed)
+                ActiveCursor.ScaleTo(1, 200, EasingTypes.OutQuad);
+            return base.OnMouseUp(state, args);
+        }
+
+        class OsuCursor : AutoSizeContainer
+        {
+            public OsuCursor()
+            {
+                Origin = Anchor.Centre;
+            }
+
+            public override void Load()
+            {
+                base.Load();
+
+                Children = new Drawable[]
+                {
+                    new Sprite
+                    {
+                        Texture = Game.Textures.Get(@"Cursor/cursor")
+                    }
+                };
+            }
+        }
+    }
+
+}