feat: ICurrentSources interface to allow for tracking breakaway routing

src/PepperDash.Essentials.Core/Devices/SourceListItem.cs

@@ -174,6 +174,13 @@ namespace PepperDash.Essentials.Core
         [JsonProperty("syncProviderDeviceKey")]
         public string SyncProviderDeviceKey { get; set; }
 
+        /// <summary>
+        /// Indicates if the source supports USB connections
+        /// </summary>
+        [JsonProperty("supportsUsb")]
+        public bool SupportsUsb { get; set; }
+
+
         /// <summary>
         /// Default constructor for SourceListItem, initializes the Icon to "Blank"
         /// </summary>