Split ControlPoint into different types.

# Conflicts:
#	osu.Game.Rulesets.Mania/UI/Column.cs

osu.Game/Beatmaps/ControlPoints/ControlPoint.cs

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+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+namespace osu.Game.Beatmaps.ControlPoints
+{
+    public class ControlPoint
+    {
+        public double Time;
+    }
+}

osu.Game/Beatmaps/ControlPoints/ControlPointInfo.cs

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+using System.Collections.Generic;
+using System.Linq;
+
+namespace osu.Game.Beatmaps.ControlPoints
+{
+    public class ControlPointInfo
+    {
+        /// <summary>
+        /// All the control points.
+        /// </summary>
+        public readonly List<ControlPoint> ControlPoints = new List<ControlPoint>();
+
+        /// <summary>
+        /// Finds the difficulty control point that is active at <paramref name="time"/>.
+        /// </summary>
+        /// <param name="time">The time to find the difficulty control point at.</param>
+        /// <returns>The difficulty control point.</returns>
+        public DifficultyControlPoint DifficultyPointAt(double time) =>
+            ControlPoints.OfType<DifficultyControlPoint>().LastOrDefault(t => t.Time <= time) ?? new DifficultyControlPoint();
+
+        /// <summary>
+        /// Finds the effect control point that is active at <paramref name="time"/>.
+        /// </summary>
+        /// <param name="time">The time to find the effect control point at.</param>
+        /// <returns>The effect control point.</returns>
+        public EffectControlPoint EffectPointAt(double time) =>
+            ControlPoints.OfType<EffectControlPoint>().LastOrDefault(t => t.Time <= time) ?? new EffectControlPoint();
+
+        /// <summary>
+        /// Finds the sound control point that is active at <paramref name="time"/>.
+        /// </summary>
+        /// <param name="time">The time to find the sound control point at.</param>
+        /// <returns>The sound control point.</returns>
+        public SoundControlPoint SoundPointAt(double time) =>
+            ControlPoints.OfType<SoundControlPoint>().LastOrDefault(t => t.Time <= time) ?? new SoundControlPoint();
+
+        /// <summary>
+        /// Finds the timing control point that is active at <paramref name="time"/>.
+        /// </summary>
+        /// <param name="time">The time to find the timing control point at.</param>
+        /// <returns>The timing control point.</returns>
+        public TimingControlPoint TimingPointAt(double time) =>
+            ControlPoints.OfType<TimingControlPoint>().LastOrDefault(t => t.Time <= time) ?? new TimingControlPoint();
+
+        /// <summary>
+        /// Finds the maximum BPM represented by any timing control point.
+        /// </summary>
+        public double BPMMaximum =>
+            60000 / (ControlPoints.OfType<TimingControlPoint>().OrderBy(c => c.BeatLength).FirstOrDefault() ?? new TimingControlPoint()).BeatLength;
+
+        /// <summary>
+        /// Finds the minimum BPM represented by any timing control point.
+        /// </summary>
+        public double BPMMinimum =>
+            60000 / (ControlPoints.OfType<TimingControlPoint>().OrderByDescending(c => c.BeatLength).FirstOrDefault() ?? new TimingControlPoint()).BeatLength;
+
+        /// <summary>
+        /// Finds the mode BPM (most common BPM) represented by the control points.
+        /// </summary>
+        public double BPMMode =>
+            60000 / (ControlPoints.OfType<TimingControlPoint>().GroupBy(c => c.BeatLength).OrderByDescending(grp => grp.Count()).FirstOrDefault()?.FirstOrDefault() ?? new TimingControlPoint()).BeatLength;
+    }
+}

osu.Game/Beatmaps/ControlPoints/DifficultyControlPoint.cs

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+namespace osu.Game.Beatmaps.ControlPoints
+{
+    public class DifficultyControlPoint : ControlPoint
+    {
+        public double SpeedMultiplier = 1;
+    }
+}

osu.Game/Beatmaps/ControlPoints/EffectControlPoint.cs

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+namespace osu.Game.Beatmaps.ControlPoints
+{
+    public class EffectControlPoint : ControlPoint
+    {
+        public bool KiaiMode;
+        public bool OmitFirstBarLine;
+    }
+}

osu.Game/Beatmaps/ControlPoints/SoundControlPoint.cs

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+namespace osu.Game.Beatmaps.ControlPoints
+{
+    public class SoundControlPoint : ControlPoint
+    {
+        public string SampleBank;
+        public int SampleVolume;
+    }
+}

osu.Game/Beatmaps/ControlPoints/TimingControlPoint.cs

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+using osu.Game.Beatmaps.Timing;
+
+namespace osu.Game.Beatmaps.ControlPoints
+{
+    public class TimingControlPoint : ControlPoint
+    {
+        public TimeSignatures TimeSignature = TimeSignatures.SimpleQuadruple;
+        public double BeatLength = 500;
+    }
+}