[C] bind to ValueTuples

[StephaneDelcroix]

Description of Change

Allow ValueTuple shorthand names to be used in Binding paths.

public class Person {
    public (string First, string Last) Name { get; set; }
}

Allow this kind of Binding path

<Label Text="{Binding Name.First}" />

It also allows to bind to anonymous tuples using the indexer (that should have worked already, but wasn't). This is possible as ValueTuple implements ITuple.

<Label Text="{Binding Name[0]}" />

Bugs Fixed

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API Changes

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Behavioral Changes

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PR Checklist

• Has tests (if omitted, state reason in description)
• Rebased on top of master at time of PR
• Changes adhere to coding standard
• Consolidate commits as makes sense