RFE: reveal lib loading errors for CPlusPlus OPs

When loading a .dll for a CPlusPlus OP, users are presented with a generic error in the case of any loading / linking issues. It would be very helpful to see some sort of error output in this case, either on the OP itself or just in the console (since you’re probably already running with the console open if you’re doing this…)

In my case, a dll depended on another dll which wasn’t copied into the build directory. The generic Windows error you get for these issues was all I needed.