Review of std.signal

[Robert]

> At any rate, a string mixin is not necessitated here at all, 
> and really hurts code readability (though mostly on the 
> implementation side). If you're having issues with templates, 
> please tell us so we can help.

You don't need it, that is true. You can use the Signal struct 
directly, it is only there for convenience. It restricts 
permission to emit the signal to the module, by wrapping it up 
into an accessor method.

Best regards,
Robert