wasm: exception loading ResourceDictionary from string

[yowl]

I'm submitting a...

• Bug report (I searched for similar issues and did not find one)

Current behavior

Attempting the following code in wasm:

XamlReader.Load(@"<ResourceDictionary
    xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation"" 
    xmlns:x=""http://schemas.microsoft.com/winfx/2006/xaml"">
    
    <Style TargetType=""TextBlock"" x:Key=""DefaultColumnStyle"">
    </Style>    
</ResourceDictionary>
");

Results in an exception as it appears to be looking for the type on the ResourceDictionary itself and not the inner Style:

System.InvalidOperationException: Implicit content is not supported on {http://schemas.microsoft.com/winfx/2006/xaml/presentation}ResourceDictionary
mono.js:1   at Windows.UI.Xaml.Markup.Reader.XamlObjectBuilder.GetMemberProperty (Windows.UI.Xaml.Markup.Reader.XamlObjectDefinition control, Windows.UI.Xaml.Markup.Reader.XamlMemberDefinition member) <0x38b0f88 + 0x000a4> in <5657f6387daa4318abd059dc46b216ac>:0 
mono.js:1   at Windows.UI.Xaml.Markup.Reader.XamlObjectBuilder.ProcessNamedMember (Windows.UI.Xaml.Markup.Reader.XamlObjectDefinition control, System.Object instance, Windows.UI.Xaml.Markup.Reader.XamlMemberDefinition member) <0x38a8a80 + 0x00126> in <5657f6387daa4318abd059dc46b216ac>:0 
mono.js:1   at Windows.UI.Xaml.Markup.Reader.XamlObjectBuilder.LoadObject (Windows.UI.Xaml.Markup.Reader.XamlObjectDefinition control) <0x3889498 + 0x001c4> in <5657f6387daa4318abd059dc46b216ac>:0 
mono.js:1   at Windows.UI.Xaml.Markup.Reader.XamlObjectBuilder.Build () <0x38803f0 + 0x0002a> in <5657f6387daa4318abd059dc46b216ac>:0 
mono.js:1   at Windows.UI.Xaml.Markup.XamlReader.Load (System.String xaml) <0x36ff0c8 + 0x0002e> in <5657f6387daa4318abd059dc46b216ac>:0 
mono.js:1   at UnoStandardRefTest.MainPage..ctor () <0x36fe608 + 0x00022> in <709e7433be0849a99e576b956664c5a9>:0 

Repo at https://github.com/yowl/UnoStandardRefTest/tree/loadrd

Expected behavior

wasm should be able to load ResourceDictionary from a string as this will help with the support of third party controls like Telerik.

Minimal reproduction of the problem with instructions

As above

Environment

Nuget Package: Uno.UI 1.43.0-dev.925

Package Version(s): 

Affected platform(s):
- [ ] iOS
- [ ] Android
- [x ] WebAssembly
- [ ] Windows
- [ ] Build tasks

Visual Studio
- [ x] 2017 (version: )
- [ ] 2017 Preview (version: )
- [ ] for Mac (version: )

Relevant plugins
- [ ] Resharper (version: )

[yowl]

rdpatch.txt
This is the quick patch a made to work around this.