Remove fancy window hiding and use old app icon

MelonVPNClient/MainWindow.cs

@@ -314,18 +314,7 @@ public partial class MainWindow : Window
         Iconify();
         SkipPagerHint = true;
         SkipTaskbarHint = true; 
-
-        // Changing the visible property needs to be
-        // delayed for the window to start minimizing
-        Thread thread = new Thread(() =>
-        {
-            Thread.Sleep(100);
-            Visible = false;
-        })
-        {
-            IsBackground = true
-        };
-        thread.Start();
+        Visible = false;
 
         UpdateTrayMenu();
     }

MelonVPNClient/gtk-gui/gui.stetic

@@ -4,6 +4,7 @@
     <images-root-path>..</images-root-path>
   </configuration>
   <import>
+    <widget-library name="glade-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f" />
     <widget-library name="../net-libs/appindicator3-sharp.dll" />
     <widget-library name="../bin/Debug/MelonVPNClient.exe" internal="true" />
   </import>