Replaced effects with decorators.

Decorators should be way more flexible while beeing easy to use.

RGB.NET.Brushes/Gradients/AbstractGradient.cs

@@ -11,7 +11,7 @@ namespace RGB.NET.Brushes.Gradients
     /// <summary>
     /// Represents a basic gradient.
     /// </summary>
-    public abstract class AbstractGradient : IGradient
+    public abstract class AbstractGradient : AbstractDecoratable<IGradientDecorator>, IGradient
     {
         #region Properties & Fields
 

RGB.NET.Brushes/Gradients/IGradient.cs

@@ -5,7 +5,7 @@ namespace RGB.NET.Brushes.Gradients
     /// <summary>
     /// Represents a basic gradient.
     /// </summary>
-    public interface IGradient
+    public interface IGradient : IDecoratable<IGradientDecorator>
     {
         /// <summary>
         /// Gets the <see cref="Color"/> of the <see cref="IGradient"/> on the specified offset.

RGB.NET.Brushes/Gradients/RainbowGradient.cs

@@ -9,7 +9,7 @@ namespace RGB.NET.Brushes.Gradients
     /// Represents a rainbow gradient which circles through all colors of the HUE-color-space.<br />
     /// See <see href="http://upload.wikimedia.org/wikipedia/commons/a/ad/HueScale.svg" /> as reference.
     /// </summary>
-    public class RainbowGradient : IGradient
+    public class RainbowGradient : AbstractDecoratable<IGradientDecorator>, IGradient
     {
         #region Properties & Fields