Cannot use option with explicit interface implementations

[pergardebrink]

Steps to reproduce

Setup interfaces and options like this:

public interface IFoo {
    [Option("foobar")]
    string FooBar { get; set; }
}
public interface IBar {
    [Option("barfoo")]
    string BarFoo { get; set; }
}

public class FooBarOptions : IFoo, IBar {
    IBar.BarFoo { get; set; }
    IFoo.FooBar { get; set; }
}

var result = Parser.Default.ParseArguments<FooBarOptions>(args)

Expected result
The options should be parsed and assigned correctly

Actual result
ArgumentException with message "factory".

The test for if a class ismutable is not seeing the explicitly defined interface properties and/or fields in a class.

[pergardebrink]

Fixed in #590