feat: move MC into Essentials

In order to solve some dependency issues that keep cropping up, MC
should be moved back into the Essentials repo and loaded automatically
on startup. This will allow for all plugins that use the MC Messengers
library to use the same version without fear of overwriting a dll due to
loading of plugin libraries.

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

@@ -0,0 +1,50 @@
+using Newtonsoft.Json;
+using PepperDash.Core;
+using PepperDash.Essentials.Core;
+using System.Collections.Generic;
+
+namespace PepperDash.Essentials.AppServer.Messengers
+{
+    public class IDspPresetsMessenger : MessengerBase
+    {
+        private IDspPresets _device;
+
+        public IDspPresetsMessenger(string key, string messagePath, IDspPresets device)
+            : base(key, messagePath, device as Device)
+        {
+            _device = device;
+        }
+
+        protected override void RegisterActions()
+        {
+            base.RegisterActions();
+
+            AddAction("/fullStatus", (id, content) =>
+            {
+                var message = new IHasDspPresetsStateMessage
+                {
+                    Presets = _device.Presets
+                };
+
+                PostStatusMessage(message);
+            });
+
+            AddAction("/recallPreset", (id, content) =>
+            {
+                var presetKey = content.ToObject<string>();
+
+
+                if (!string.IsNullOrEmpty(presetKey))
+                {
+                    _device.RecallPreset(presetKey);
+                }
+            });
+        }
+    }
+
+    public class IHasDspPresetsStateMessage : DeviceStateMessageBase
+    {
+        [JsonProperty("presets")]
+        public Dictionary<string, IKeyName> Presets { get; set; }
+    }
+}