fix: ignore CameraBase routing port list

The `RoutingPortCollection` type appears to not be currently
serializable. If a class that contains this collection is going to be
serialized, the collection should have the `JsonIgnore` attribute added.
If the list is needed, use a conversion object and convert it to a
regular list.

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

@@ -1,4 +1,5 @@
-using System;
+using Newtonsoft.Json;
+using System;
 
 
 namespace PepperDash.Essentials.Core
@@ -8,10 +9,11 @@ namespace PepperDash.Essentials.Core
     /// </summary>
     public class RoutingInputPort : RoutingPort
 	{
-		/// <summary>
-		/// The IRoutingInputs object this lives on
-		/// </summary>
-		public IRoutingInputs ParentDevice { get; private set; }
+        /// <summary>
+        /// The IRoutingInputs object this lives on
+        /// </summary>
+        [JsonIgnore]
+        public IRoutingInputs ParentDevice { get; private set; }
 
 		/// <summary>
 		/// Constructor for a basic RoutingInputPort

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

@@ -1,14 +1,17 @@
-using System;
+using Newtonsoft.Json;
+using System;
 
 
 namespace PepperDash.Essentials.Core
 {
     public class RoutingOutputPort : RoutingPort
-	{
-		/// <summary>
-		/// The IRoutingOutputs object this port lives on
-		/// </summary>
-		public IRoutingOutputs ParentDevice { get; private set; }
+    {
+        /// <summary>
+        /// The IRoutingOutputs object this port lives on
+        /// </summary>
+        ///
+        [JsonIgnore]
+        public IRoutingOutputs ParentDevice { get; private set; }
 
 		public InUseTracking InUseTracker { get; private set; }
 

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

@@ -2,9 +2,6 @@
 using System.Collections.Generic;
 using System.Linq;
 
-using PepperDash.Core;
-
-
 namespace PepperDash.Essentials.Core
 {
 	/// <summary>