feature: Add support to Shell

[giusepe]

Is your feature request related to a problem? Please describe.

Currently Sextant don't support Xamarin.Forms.Shell and neither does shell support any MVVM Framework.

Describe the solution you'd like

Once a solution is born from this issue: xamarin/Xamarin.Forms#5166
I suggest to discuss this with the Xamarin team to see how we can make our life easier.

Describe alternatives you've considered

Describe suggestions on how to achieve the feature

Additional context

AFAIK they are still working on a specification and that should be share soon, so let's be ready to participate.

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[jecarlos14]

Any update for this @RLittlesII ?

[glennawatson]

It's not happening anytime soon due to issues on the Microsoft time. There's a reason why prism etc haven't done it either.

There is currently some work the Xamarin.Forms team is doing to support MVVM with Shell. Last I was told that work is being tracked here xamarin/Xamarin.Forms#5166

[RLittlesII]

@jeanberrocalGL As stated in the body of the issue, there is work the Xamarin.Forms team has to do in order to make this feature possible. I have seen some of the work towards that end, and I have seen some of the extension points. I have not gone down the road of attempting an implementation because as I see it the entire API surface may have to change just to support Shell.