refactor: move routing interfaces into their own files

src/PepperDash.Essentials.Core/Routing/IRoutingWithClear.cs

@@ -0,0 +1,12 @@
+namespace PepperDash.Essentials.Core
+{
+    public interface IRoutingWithClear : IRouting
+    {
+        /// <summary>
+        /// Clears a route to an output, however a device needs to do that
+        /// </summary>
+        /// <param name="outputSelector">Output to clear</param>
+        /// <param name="signalType">signal type to clear</param>
+        void ClearRoute(object outputSelector, eRoutingSignalType signalType);
+    }
+}