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/RoutingPortCollection.cs

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