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/SIMPLRouteMessenger.cs

@@ -0,0 +1,77 @@
+using Crestron.SimplSharpPro.DeviceSupport;
+using Newtonsoft.Json.Linq;
+using PepperDash.Essentials.Core;
+using PepperDash.Essentials.Core.DeviceTypeInterfaces;
+
+
+namespace PepperDash.Essentials.AppServer.Messengers
+{
+
+    public class SIMPLRouteMessenger : MessengerBase
+    {
+        private readonly BasicTriList _eisc;
+
+        private readonly uint _joinStart;
+
+        public class StringJoin
+        {
+            /// <summary>
+            /// 1
+            /// </summary>
+            public const uint CurrentSource = 1;
+        }
+
+        public SIMPLRouteMessenger(string key, BasicTriList eisc, string messagePath, uint joinStart)
+            : base(key, messagePath)
+        {
+            _eisc = eisc;
+            _joinStart = joinStart - 1;
+
+            _eisc.SetStringSigAction(_joinStart + StringJoin.CurrentSource, SendRoutingFullMessageObject);
+        }
+
+#if SERIES4
+        protected override void RegisterActions()
+#else
+        protected override void CustomRegisterWithAppServer(MobileControlSystemController appServerController)
+#endif
+        {
+            AddAction("/fullStatus",
+                (id, content) => SendRoutingFullMessageObject(_eisc.GetString(_joinStart + StringJoin.CurrentSource)));
+
+            AddAction("/source", (id, content) =>
+            {
+                var c = content.ToObject<SourceSelectMessageContent>();
+
+                _eisc.SetString(_joinStart + StringJoin.CurrentSource, c.SourceListItemKey);
+            });
+        }
+
+#if SERIES4
+        public void CustomUnregsiterWithAppServer(IMobileControl appServerController)
+#else
+        public void CustomUnregsiterWithAppServer(MobileControlSystemController appServerController)
+#endif
+        {
+            appServerController.RemoveAction(MessagePath + "/fullStatus");
+            appServerController.RemoveAction(MessagePath + "/source");
+
+            _eisc.SetStringSigAction(_joinStart + StringJoin.CurrentSource, null);
+        }
+
+        /// <summary>
+        /// Helper method to update full status of the routing device
+        /// </summary>
+        private void SendRoutingFullMessageObject(string sourceKey)
+        {
+            if (string.IsNullOrEmpty(sourceKey))
+                sourceKey = "none";
+
+            PostStatusMessage(JToken.FromObject(new
+                {
+                    selectedSourceKey = sourceKey
+                })
+            );
+        }
+    }
+}