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/ITswZoomControlMessenger.cs

@@ -0,0 +1,73 @@
+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 ITswZoomControlMessenger : MessengerBase
+    {
+        private readonly ITswZoomControl _zoomControl;
+
+        public ITswZoomControlMessenger(string key, string messagePath, Device device) : base(key, messagePath, device)
+        {
+            _zoomControl = device as ITswZoomControl;
+        }
+
+        protected override void RegisterActions()
+        {
+            if (_zoomControl == null)
+            {
+                Debug.Console(0, this, $"{_device.Key} does not implement ITswZoomControl");
+                return;
+            }
+
+            AddAction($"/fullStatus", (id, context) => SendFullStatus());
+
+
+            AddAction($"/endCall", (id, context) => _zoomControl.EndZoomCall());
+
+            _zoomControl.ZoomIncomingCallFeedback.OutputChange += (s, a) =>
+            {
+                PostStatusMessage(JToken.FromObject(new
+                {
+                    incomingCall = a.BoolValue,
+                    inCall = _zoomControl.ZoomInCallFeedback.BoolValue
+                }));
+            };
+
+
+            _zoomControl.ZoomInCallFeedback.OutputChange += (s, a) =>
+            {                
+                PostStatusMessage(JToken.FromObject(
+                new
+                {
+                    inCall = a.BoolValue,
+                    incomingCall = _zoomControl.ZoomIncomingCallFeedback.BoolValue
+                }));
+            };
+        }
+
+        private void SendFullStatus()
+        {
+            var message = new TswZoomStateMessage
+            {
+                InCall = _zoomControl?.ZoomInCallFeedback.BoolValue,
+                IncomingCall = _zoomControl?.ZoomIncomingCallFeedback.BoolValue
+            };
+
+            PostStatusMessage(message);
+        }
+    }
+
+    public class TswZoomStateMessage : DeviceStateMessageBase
+    {
+        [JsonProperty("inCall", NullValueHandling = NullValueHandling.Ignore)]
+        public bool? InCall { get; set; }
+
+        [JsonProperty("incomingCall", NullValueHandling = NullValueHandling.Ignore)]
+        public bool? IncomingCall { get; set; }
+    }
+}