fix: add constructor that takes IHasInputs<T>

In order to satisfy the requirements for the `MessengerBase` class, the
`ISelectableItemsMessenger` class needs to take an `IHasInputs<T>`, as that is
the device that implements `IKeyName`. We may want to consider adding a
`IHasInputsMessenger` specifically for those devices that implement that
interface vs the `ISelectableItemsMessenger`.

src/PepperDash.Essentials.MobileControl.Messengers/Messengers/ISelectableItemsMessenger.cs

@@ -1,6 +1,4 @@
 using Newtonsoft.Json;
-using Newtonsoft.Json.Converters;
-using Newtonsoft.Json.Linq;
 using PepperDash.Core;
 using PepperDash.Core.Logging;
 using PepperDash.Essentials.Core.DeviceTypeInterfaces;
@@ -11,16 +9,36 @@ namespace PepperDash.Essentials.AppServer.Messengers
 {
     public class ISelectableItemsMessenger<TKey> : MessengerBase
     {        
-        private static readonly JsonSerializer serializer = new JsonSerializer { Converters = { new StringEnumConverter() } };
         private readonly ISelectableItems<TKey> itemDevice;
 
         private readonly string _propName;
+
+        /// <summary>
+        /// Constructs a messenger for a device that implements ISelectableItems<typeparamref name="TKey"/>
+        /// </summary>
+        /// <param name="key"></param>
+        /// <param name="messagePath"></param>
+        /// <param name="device"></param>
+        /// <param name="propName"></param>
         public ISelectableItemsMessenger(string key, string messagePath, ISelectableItems<TKey> device, string propName) : base(key, messagePath, device as IKeyName)
         {
             itemDevice = device;
             _propName = propName;
         }
 
+        /// <summary>
+        /// Constructs a messenger for a device that implements IHasInputs<typeparamref name="TKey"/>
+        /// </summary>
+        /// <param name="key"></param>
+        /// <param name="messagePath"></param>
+        /// <param name="device"></param>
+        /// <param name="propName"></param>
+        public ISelectableItemsMessenger(string key, string messagePath, IHasInputs<TKey> device, string propName) : base(key, messagePath, device)
+        {
+            itemDevice = device.Inputs;
+            _propName = propName;
+        }
+
         protected override void RegisterActions()
         {
             base.RegisterActions();

src/PepperDash.Essentials.MobileControl/MobileControlSystemController.cs

@@ -766,7 +766,7 @@ namespace PepperDash.Essentials
                         var messenger = new ISelectableItemsMessenger<string>(
                             $"{device.Key}-inputs-{Key}",
                             $"/device/{device.Key}",
-                            stringInputs.Inputs,
+                            stringInputs,
                             "inputs"
                         );
 
@@ -782,7 +782,7 @@ namespace PepperDash.Essentials
                         var messenger = new ISelectableItemsMessenger<byte>(
                             $"{device.Key}-inputs-{Key}",
                             $"/device/{device.Key}",
-                            byteInputs.Inputs,
+                            byteInputs,
                             "inputs"
                         );
 
@@ -798,7 +798,7 @@ namespace PepperDash.Essentials
                         var messenger = new ISelectableItemsMessenger<int>(
                             $"{device.Key}-inputs-{Key}",
                             $"/device/{device.Key}",
-                            intInputs.Inputs,
+                            intInputs,
                             "inputs"
                         );