[BUG] Constant strings in attributes not treated like regular strings

[lobster2012-user]

Describe the bug

build - OK
runtime - OK

public interface IClient
{
     [Get("/path")]
     void Get();
}

compile - OK
runtime - FAILED:doesn't look like a Refit interface

public static class Paths
{
      public const string Path = "/path";
}
public interface IClient
{
     [Get(Paths.Path)]
     void Get();
}

It seems the problem is here.

 public bool HasRefitHttpMethodAttribute(MethodDeclarationSyntax method)
        {
            // We could also verify that the single argument is a string, 
            // but what if somebody is dumb and uses a constant?
            // Could be turtles all the way down.
            return method.AttributeLists.SelectMany(a => a.Attributes)
                         .Any(a => HttpMethodAttributeNames.Contains(a.Name.ToString().Split('.').Last()) &&
                                   a.ArgumentList.Arguments.Count == 1 &&
                                   a.ArgumentList.Arguments[0].Expression.Kind() == **SyntaxKind.StringLiteralExpression**);
        }

Is it possible to fix it?

[bennor]

Duplicate of #263