SetupAllProperties tries to set up inaccessible properties

[stakx]

#455 made Moq more strict with regard to inaccessible methods: if an attempt is made to set up such a one, setup methods now throw an exception. What was forgotten back then is that mock.SetupAllProperties() will try to set even inaccessible methods (it doesn't perform the appropriate check), leading to exceptions in use cases such as #491 or the following:

internal interface IFooInternals
{
	object C { get; }
	object D { get; }
}

public abstract class Foo : IFooInternals
{
	public virtual object C => "C";
	public object D => "D";
}

[Fact] // does not pass
public void SetupAllProperties_skips_inaccessible_properties_instead_of_throwing()
{
    var mock = new Mock<Foo>();

    var exception = Record.Exception(() =>
    {
        mock.SetupAllProperties();
    });

    Assert.Null(exception);
}