Feature: Add ReactiveProperty

[ChrisPulman]

What kind of change does this PR introduce?

Feature

What is the current behavior?

Boiler plate code is required to get an Observable Property

What is the new behavior?

A quick and simple ReactiveProperty has been added to suit a small number of properties.
ReactiveProperty is a two way bindable declarative observable property with imperative get set Value.
Useful when mixing different UI Frameworks without the requirement for a ReactiveObject based ViewModel

Declare as

IReactiveProperty<string> MyProperty { get; } = new ReactiveProperty<string>();

Use declarativly

MyProperty.Subscribe(x => // use x as desired);

Use imperativly

MyProperty.Value = "Set the value";
var value = MyProperty.Value;

Use XAML Bindings

{Binding MyProperty.Value}

What might this PR break?

None

Please check if the PR fulfills these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Other information:

[glennawatson]

Wonder if additions like this, which isn't required for the core code, should go into a ReactiveUI.Extras NuGet package or something.

[ChrisPulman]

Wonder if additions like this, which isn't required for the core code, should go into a ReactiveUI.Extras NuGet package or something.

I think the key thing is to have this within the .Net Foundation so that people can use it in certain situations where they cant use other sources of packages.

As its such a small addition I thought that having it in the base allows it to be used in any implementation.

If it needs to be in a separate package then i can move it to another project within ReactiveUI.

[github-actions]

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