Overhaulled the CoreMIDI driver.  Added queue objects.  Added proper event times (I think).  WARNING: I've never programmed for Mac.  I don't have a Mac development environment.  I haven't tested or compiled the code I'm committing (Stephane said he'd take care of that).  Don't expect this code to run without a thorough debug and fix session.  That said, I hope this code can be turned into something workable.