Remove the concept of beatmap events, rename BreakEvent -> BreakPeriod.

osu.Game/Beatmaps/Timing/BreakPeriod.cs

@@ -0,0 +1,33 @@
+// 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.Timing
+{
+    public class BreakPeriod
+    {
+        /// <summary>
+        /// The minimum duration required for a break to have any effect.
+        /// </summary>
+        private const double min_break_duration = 650;
+
+        /// <summary>
+        /// The break start time.
+        /// </summary>
+        public double StartTime;
+
+        /// <summary>
+        /// The break end time.
+        /// </summary>
+        public double EndTime;
+
+        /// <summary>
+        /// The break duration.
+        /// </summary>
+        public double Duration => EndTime - StartTime;
+
+        /// <summary>
+        /// Whether the break has any effect. Breaks that are too short are culled before they are added to the beatmap.
+        /// </summary>
+        public bool HasEffect => Duration >= min_break_duration;
+    }
+}