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/IHumiditySensor.cs

@@ -0,0 +1,43 @@
+using Newtonsoft.Json;
+using PepperDash.Core;
+using PepperDash.Essentials.Core.DeviceTypeInterfaces;
+using System;
+
+namespace PepperDash.Essentials.AppServer.Messengers
+{
+    public class IHumiditySensorMessenger : MessengerBase
+    {
+        private readonly IHumiditySensor device;
+
+        public IHumiditySensorMessenger(string key, IHumiditySensor device, string messagePath)
+            : base(key, messagePath, device as Device)
+        {
+            this.device = device;
+        }
+
+        protected override void RegisterActions()
+        {
+            base.RegisterActions();
+
+            AddAction("/fullStatus", (id, content) => SendFullStatus());
+
+            device.HumidityFeedback.OutputChange += new EventHandler<Core.FeedbackEventArgs>((o, a) => SendFullStatus());
+        }
+
+        private void SendFullStatus()
+        {
+            var state = new IHumiditySensorStateMessage
+            {
+                Humidity = string.Format("{0}%", device.HumidityFeedback.UShortValue)
+            };
+
+            PostStatusMessage(state);
+        }
+    }
+
+    public class IHumiditySensorStateMessage : DeviceStateMessageBase
+    {
+        [JsonProperty("humidity")]
+        public string Humidity { get; set; }
+    }
+}