Add Avalonia.Animation assembly to the pre-scanned assemblies to fix unit tests.

src/Markup/Avalonia.Markup.Xaml/PortableXaml/AvaloniaRuntimeTypeProvider.cs

@@ -7,7 +7,6 @@ using System.Linq;
 using System.Reflection;
 using Avalonia.Controls;
 using Avalonia.Data;
-using Avalonia.Markup.Data;
 using Avalonia.Markup.Xaml.Templates;
 using Avalonia.Media;
 using Avalonia.Metadata;
@@ -33,6 +32,7 @@ namespace Avalonia.Markup.Xaml.Context
         private static readonly IEnumerable<Assembly> ForcedAssemblies = new[]
         {
             typeof(AvaloniaObject).GetTypeInfo().Assembly,
+            typeof(Animation.Animation).GetTypeInfo().Assembly,
             typeof(Control).GetTypeInfo().Assembly,
             typeof(Style).GetTypeInfo().Assembly,
             typeof(DataTemplate).GetTypeInfo().Assembly,
@@ -146,4 +146,4 @@ namespace Avalonia.Markup.Xaml.Context
             return null;
         }
     }
-}
+}