chore: move classes and interfaces to individual files

src/PepperDash.Essentials.MobileControl.Messengers/Messengers/DeviceEventMessageBase.cs

@@ -0,0 +1,17 @@
+using Newtonsoft.Json;
+
+namespace PepperDash.Essentials.AppServer.Messengers
+{
+  /// <summary>
+  /// Base class for event messages that include the type of message and an event type
+  /// </summary>
+  public abstract class DeviceEventMessageBase : DeviceMessageBase
+  {
+    /// <summary>
+    /// The event type
+    /// </summary>
+    [JsonProperty("eventType")]
+    public string EventType { get; set; }
+  }
+
+}