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/Interfaces.cs

@@ -0,0 +1,16 @@
+using System;
+
+namespace PepperDash.Essentials.Room.MobileControl
+{
+    /// <summary>
+    /// Represents a room whose configuration is derived from runtime data,
+    /// perhaps from another program, and that the data may not be fully
+    /// available at startup.
+    /// </summary>
+    public interface IDelayedConfiguration
+    {
+
+        
+        event EventHandler<EventArgs> ConfigurationIsReady;
+    }
+}