Layer effects - WIP commit

Profile editor - Show brush icons at different parts in the editor

src/Artemis.Core/Models/Profile/LayerProperties/Attributes/PropertyGroupDescriptionAttribute.cs

@@ -13,10 +13,5 @@ namespace Artemis.Core.Models.Profile.LayerProperties.Attributes
         ///     The user-friendly description for this property, shown in the UI.
         /// </summary>
         public string Description { get; set; }
-
-        /// <summary>
-        ///     Whether to expand this property by default, this is useful for important parent properties.
-        /// </summary>
-        public bool ExpandByDefault { get; set; }
     }
 }

src/Artemis.Core/Models/Profile/LayerProperties/Types/LayerEffectReferenceLayerProperty.cs

@@ -0,0 +1,22 @@
+using Artemis.Core.Exceptions;
+
+namespace Artemis.Core.Models.Profile.LayerProperties.Types
+{
+    /// <summary>
+    /// A special layer property used to configure the selected layer effect
+    /// </summary>
+    public class LayerEffectReferenceLayerProperty : LayerProperty<LayerEffectReference>
+    {
+        internal LayerEffectReferenceLayerProperty()
+        {
+            KeyframesSupported = false;
+        }
+
+        protected override void UpdateCurrentValue(float keyframeProgress, float keyframeProgressEased)
+        {
+            throw new ArtemisCoreException("Layer effect references do not support keyframes.");
+        }
+
+        public static implicit operator LayerEffectReference(LayerEffectReferenceLayerProperty p) => p.CurrentValue;
+    }
+}