Nuget - Updated packages

Brush properties - Added default values
Brush properties - Removed option to always auto-expand groups
Layer properties - Remember expanded/collapsed groups
Storage - Added migration system
Storage - Added migration that removes profiles made in the old layer properties format
Layer timeline - Added back zoom functionality

src/Artemis.Core/Models/Profile/LayerProperties/BaseLayerProperty.cs

@@ -141,5 +141,7 @@ namespace Artemis.Core.Models.Profile.LayerProperties
         }
 
         #endregion
+
+        public abstract void ApplyDefaultValue();
     }
 }

src/Artemis.Core/Models/Profile/LayerProperties/LayerProperty.cs

@@ -55,6 +55,12 @@ namespace Artemis.Core.Models.Profile.LayerProperties
             internal set => _currentValue = value;
         }
 
+        /// <summary>
+        ///     Gets or sets the default value of this layer property. If set, this value is automatically applied if the property has no
+        ///     value in storage
+        /// </summary>
+        public T DefaultValue { get; set; }
+
         /// <summary>
         ///     Gets a read-only list of all the keyframes on this layer property
         /// </summary>
@@ -275,5 +281,10 @@ namespace Artemis.Core.Models.Profile.LayerProperties
                 EasingFunction = (int) k.EasingFunction
             }));
         }
+
+        public override void ApplyDefaultValue()
+        {
+            CurrentValue = DefaultValue;
+        }
     }
 }

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

@@ -1,5 +1,6 @@
 using Artemis.Core.Exceptions;
 using Artemis.Core.Models.Profile.Colors;
+using Artemis.Storage.Entities.Profile;
 
 namespace Artemis.Core.Models.Profile.LayerProperties.Types
 {
@@ -11,6 +12,18 @@ namespace Artemis.Core.Models.Profile.LayerProperties.Types
             KeyframesSupported = false;
         }
 
+        internal override void ApplyToLayerProperty(PropertyEntity entity, LayerPropertyGroup layerPropertyGroup, bool fromStorage)
+        {
+            base.ApplyToLayerProperty(entity, layerPropertyGroup, fromStorage);
+            
+            // Don't allow color gradients to be null
+            if (BaseValue == null)
+            {
+                BaseValue = DefaultValue ?? new ColorGradient();
+            }
+            
+        }
+
         protected override void UpdateCurrentValue(float keyframeProgress, float keyframeProgressEased)
         {
             throw new ArtemisCoreException("Color Gradients do not support keyframes.");