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Add support for Auto for Width and Height properties

See original GitHub issue

Repro:

<DockPanel LastChildFill="True" Background="Pink">
    <DockPanel LastChildFill="True" Width="180" DockPanel.Dock="Left">
        <Border Background="Red" Width="180" Height="250" DockPanel.Dock="Top"/>
        <Border Background="Blue" Width="180" Height="Auto" DockPanel.Dock="Bottom"/>
    </DockPanel>
    <DockPanel LastChildFill="True" Width="240" DockPanel.Dock="Right">
        <Border Background="Green" Width="240" Height="250" DockPanel.Dock="Top"/>
        <Border Background="Orange" Width="240" Height="Auto" DockPanel.Dock="Bottom"/>
    </DockPanel>
    <Grid>
        <Border Background="Gray" Width="300" Height="300"/>
    </Grid>
</DockPanel>

Exception:

Portable.Xaml.XamlObjectWriterException
  HResult=0x80131500
  Message=Could not convert object 'Auto' (of type System.String) to {http://schemas.microsoft.com/winfx/2006/xaml}Double: Auto is not a valid value for Double.
  Source=Avalonia.Markup.Xaml
  StackTrace:
   at Portable.Xaml.XamlObjectWriterInternal.GetCorrectlyTypedValue(XamlMember xm, XamlType xt, Object value)
   at Portable.Xaml.XamlObjectWriterInternal.StoreAppropriatelyTypedValue(ObjectState state, MemberAndValue ms, Object obj, Object keyObj)
   at Portable.Xaml.XamlObjectWriterInternal.OnWriteValue(Object value)
   at Portable.Xaml.XamlServices.Transform(XamlReader xamlReader, XamlWriter xamlWriter, Boolean closeWriter)
   at Avalonia.Markup.Xaml.AvaloniaXamlLoader.LoadFromReader(XamlReader reader, AvaloniaXamlContext context, IAmbientProvider parentAmbientProvider)
   at Avalonia.Markup.Xaml.AvaloniaXamlLoader.Load(Stream stream, Assembly localAssembly, Object rootInstance, Uri uri)
   at Avalonia.Markup.Xaml.AvaloniaXamlLoader.Load(Type type, Object rootInstance)
   at Avalonia.Markup.Xaml.AvaloniaXamlLoader.Load(Object obj)
   at Core2D.Avalonia.Views.MainControl.InitializeComponent() in D:\DOWNLOADS\GitHub-Avalonia\Core2D\src\Core2D.Avalonia\Views\MainControl.xaml.cs:line 26
   at Core2D.Avalonia.Views.MainControl..ctor() in D:\DOWNLOADS\GitHub-Avalonia\Core2D\src\Core2D.Avalonia\Views\MainControl.xaml.cs:line 18

Inner Exception 1:
Exception: Auto is not a valid value for Double.

Inner Exception 2:
FormatException: Input string was not in a correct format.