Move play modes to Modes namespace.

osu.Game/Modes/Objects/HitObject.cs

@@ -0,0 +1,38 @@
+//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.Game.Beatmaps.Samples;
+using osu.Game.Modes.Objects.Osu;
+using OpenTK.Graphics;
+
+namespace osu.Game.Modes.Objects
+{
+    /// <summary>
+    /// A hitobject describes a point in a beatmap 
+    /// </summary>
+    public abstract class HitObject
+    {
+        public double StartTime;
+        public virtual double EndTime => StartTime;
+
+        public bool NewCombo { get; set; }
+
+        public Color4 Colour = new Color4(17, 136, 170, 255);
+
+        public double Duration => EndTime - StartTime;
+
+        public HitSampleInfo Sample;
+
+        public static HitObject Parse(PlayMode mode, string val)
+        {
+            //TODO: move to modular HitObjectParser system rather than static parsing. (https://github.com/ppy/osu/pull/60/files#r83135780)
+            switch (mode)
+            {
+                case PlayMode.Osu:
+                    return OsuBaseHit.Parse(val);
+                default:
+                    return null;
+            }
+        }
+    }
+}