Added ZIndex to groups and effects

Devices/Keyboard/Keys/BaseKeyGroup.cs

@@ -15,6 +15,8 @@ namespace CUE.NET.Devices.Keyboard.Keys
 
         public IBrush Brush { get; set; }
 
+        public int ZIndex { get; set; } = 0;
+
         #endregion
 
         #region Constructors

Devices/Keyboard/Keys/IKeyGroup.cs

@@ -8,5 +8,7 @@ namespace CUE.NET.Devices.Keyboard.Keys
         IEnumerable<CorsairKey> Keys { get; }
 
         IBrush Brush { get; set; }
+
+        int ZIndex { get; set; }
     }
 }