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/Touchpanel/ITswAppControlMessenger.cs

@@ -0,0 +1,59 @@
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using PepperDash.Core;
+using PepperDash.Essentials.AppServer.Messengers;
+using PepperDash.Essentials.Core.DeviceTypeInterfaces;
+
+namespace PepperDash.Essentials.Touchpanel
+{
+    public class ITswAppControlMessenger : MessengerBase
+    {
+        private readonly ITswAppControl _appControl;
+
+        public ITswAppControlMessenger(string key, string messagePath, Device device) : base(key, messagePath, device)
+        {
+            _appControl = device as ITswAppControl;
+        }
+
+        protected override void RegisterActions()
+        {
+            if (_appControl == null)
+            {
+                Debug.Console(0, this, $"{_device.Key} does not implement ITswAppControl");
+                return;
+            }
+
+            AddAction($"/fullStatus", (id, context) => SendFullStatus());
+
+            AddAction($"/openApp", (id, context) => _appControl.OpenApp());
+
+            AddAction($"/closeApp", (id, context) => _appControl.CloseOpenApp());
+
+            AddAction($"/hideApp", (id, context) => _appControl.HideOpenApp());
+
+            _appControl.AppOpenFeedback.OutputChange += (s, a) =>
+            {
+                PostStatusMessage(JToken.FromObject(new
+                {
+                    appOpen = a.BoolValue
+                }));
+            };
+        }
+
+        private void SendFullStatus()
+        {
+            var message = new TswAppStateMessage
+            {
+                AppOpen = _appControl.AppOpenFeedback.BoolValue,
+            };
+
+            PostStatusMessage(message);
+        }
+    }
+
+    public class TswAppStateMessage : DeviceStateMessageBase
+    {
+        [JsonProperty("appOpen", NullValueHandling = NullValueHandling.Ignore)]
+        public bool? AppOpen { get; set; }
+    }
+}