WinForms - new demo project

[rallets]

I just submitted a PR with the a new WinForms demo project. Let me know if I need to improve something!
PR #518
Ps. the build failed, but because of the Blazor project, I don't think it's related to my PR.

The demo implements:

• Dependency injection with Splat, views, and services.
• How to use a main entry-point with Routing and UserControls.
• How to open a new Form (outside the main routing).
• Routing between screens/views.
• Binding data and execute commands between View and ViewModel.
• Bind to reactive properties (as calculated fields).
• How to bind data to a ListBox via DataSource.
• How to deal with UI events (via ReactiveMarbles.ObservableEvents.SourceGenerator).
• How to use Interactions to show Modal form with or without DialogResult.
• How to subscribe to UI changes like TextBox and ComboBox with sort info, and refresh the data in the UI.
• How to use Dynamic Data and deal with Collections. See the note below.
• Unit testing with custom scheduler and time-based scenarios.
• etc.

[glennawatson]

Thanks I'll get around to doing a proper review this weekend and probably fix that blazor stuff first.

Thanks for helping out

[rallets]

I think there is a glitch in the ItemsViewModel ItemsFiltered property using initialValue. If I remove initialValue everything works as expected, otherwise it doesn't update when a new value is emitted and the list remain empty. I'm wondering if you can give me a feedback about this when you review it.

[github-actions]

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