refactor: rearrange and add solution for 4-series

src/PepperDash.Essentials.Core/Fusion/FusionEventHandlers.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Crestron.SimplSharp;
+
+namespace PepperDash.Essentials.Core.Fusion
+{
+    public class ScheduleChangeEventArgs : EventArgs
+    {
+        public RoomSchedule Schedule { get; set; }
+    }
+
+    public class MeetingChangeEventArgs : EventArgs
+    {
+        public Event Meeting { get; set; }
+    }
+}