refactor: rearrange and add solution for 4-series

src/PepperDash.Essentials.Core/InUseTracking/IInUseTracking.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Crestron.SimplSharp;
+
+namespace PepperDash.Essentials.Core
+{
+	/// <summary>
+	/// Defines a class that uses an InUseTracker
+	/// </summary>
+	public interface IInUseTracking
+	{
+		InUseTracking InUseTracker { get; }
+	}
+}