Core - Made FloatRange and IntRange readonly structs

ColorGradient - Fixed missing subscribtions when using object list manipulation API
ColorGradient - Fixed editor VM going out of sync

src/Artemis.Core/Plugins/LayerBrushes/Internal/PropertiesLayerBrush.cs

@@ -39,8 +39,6 @@ namespace Artemis.Core.LayerBrushes
             PropertyGroupDescriptionAttribute groupDescription = new() {Identifier = "Brush", Name = Descriptor.DisplayName, Description = Descriptor.Description};
             Properties.Initialize(Layer, null, groupDescription, propertyGroupEntity);
             PropertiesInitialized = true;
-
-            EnableLayerBrush();
         }
     }
 }