Changed to worker instead of thread for image sending.

Possible improvements to Hyperion image requests.

Author: RickDB

AtmoLight.Core/Core.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.ComponentModel;
 using System.Diagnostics;
 using System.Drawing;
 using System.Drawing.Imaging;
@@ -270,6 +271,7 @@ public void Dispose()
 
       // Stop Target change image worker thread
       targetChangeImageEnabled = false;
+      TargetChangeImageWorker.CancelAsync();
 
       // Stop API server
       StopAPIserverThread();
@@ -281,6 +283,7 @@ public void Dispose()
     /// Generate all targets and initialise them.
     /// </summary>
     /// <returns></returns>
+    BackgroundWorker TargetChangeImageWorker = new BackgroundWorker();
 
     public void Initialise()
     {
@@ -292,11 +295,12 @@ public void Initialise()
         }
       }
 
-      // Start Target change image worker thread
       targetChangeImageEnabled = true;
-      Thread t = new Thread(TargetChangeImageWorker);
-      t.IsBackground = true;
-      t.Start();
+     
+      TargetChangeImageWorker.WorkerReportsProgress = false;
+      TargetChangeImageWorker.WorkerSupportsCancellation = true;
+      TargetChangeImageWorker.DoWork += TargetChangeDoWork;
+      TargetChangeImageWorker.RunWorkerAsync();
 
       // Start API server
       apiServerLock = false;
@@ -755,7 +759,7 @@ private void SendPixelData(byte[] pixelData, byte[] bmiInfoHeader, bool force =
       targetChangeImageQueue.Enqueue(data);
     }
 
-    private void TargetChangeImageWorker()
+    private void TargetChangeDoWork(object sender, DoWorkEventArgs e)
     {
       ChangeImageData data;