Implement mod panel for new mod select screen

osu.Game.Tests/Visual/UserInterface/TestSceneModPanel.cs

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+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using NUnit.Framework;
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Game.Overlays;
+using osu.Game.Overlays.Mods;
+using osu.Game.Rulesets.Osu.Mods;
+using osuTK;
+
+namespace osu.Game.Tests.Visual.UserInterface
+{
+    [TestFixture]
+    public class TestSceneModPanel : OsuManualInputManagerTestScene
+    {
+        [Cached]
+        private OverlayColourProvider colourProvider = new OverlayColourProvider(OverlayColourScheme.Green);
+
+        [Test]
+        public void TestVariousPanels()
+        {
+            AddStep("create content", () => Child = new FillFlowContainer
+            {
+                Width = 300,
+                AutoSizeAxes = Axes.Y,
+                Anchor = Anchor.Centre,
+                Origin = Anchor.Centre,
+                Spacing = new Vector2(0, 5),
+                Children = new[]
+                {
+                    new ModPanel(new OsuModHalfTime()),
+                    new ModPanel(new OsuModFlashlight()),
+                    new ModPanel(new OsuModAutoplay()),
+                    new ModPanel(new OsuModAlternate()),
+                    new ModPanel(new OsuModApproachDifferent())
+                }
+            });
+        }
+    }
+}