Move Avalonia.Styling to be below Avalonia.Animation in the dependency chain per conversation in Gitter.

src/Avalonia.Animation/Animatable.cs

@@ -16,7 +16,7 @@ namespace Avalonia.Animation
     /// <summary>
     /// Base class for control which can have property transitions.
     /// </summary>
-    public class Animatable : AvaloniaObject
+    public class Animatable : StyledElement
     {
         /// <summary>
         /// Initializes this <see cref="Animatable"/> object.

src/Avalonia.Animation/Avalonia.Animation.csproj

@@ -4,6 +4,7 @@
   </PropertyGroup>
   <ItemGroup>
     <ProjectReference Include="..\Avalonia.Base\Avalonia.Base.csproj" />
+    <ProjectReference Include="..\Avalonia.Styling\Avalonia.Styling.csproj" />
   </ItemGroup>
   <Import Project="..\..\build\Rx.props" />
 </Project>

src/Avalonia.Styling/StyledElement.cs

@@ -5,7 +5,6 @@ using System.Linq;
 using System.Reactive.Linq;
 using System.Reactive.Subjects;
 using System.Text;
-using Avalonia.Animation;
 using Avalonia.Collections;
 using Avalonia.Controls;
 using Avalonia.Data;
@@ -17,14 +16,14 @@ using Avalonia.Styling;
 namespace Avalonia
 {
     /// <summary>
-    /// Extends an <see cref="Animatable"/> with the following features:
+    /// Extends an <see cref="AvaloniaObject"/> with the following features:
     /// 
     /// - An inherited <see cref="DataContext"/>.
     /// - Implements <see cref="IStyleable"/> to allow styling to work on the styled element.
     /// - Implements <see cref="ILogical"/> to form part of a logical tree.
     /// - A collection of class strings for custom styling.
     /// </summary>
-    public class StyledElement : Animatable, IStyledElement, ISetLogicalParent, ISetInheritanceParent
+    public class StyledElement : AvaloniaObject, IStyledElement, ISetLogicalParent, ISetInheritanceParent
     {
         /// <summary>
         /// Defines the <see cref="DataContext"/> property.