Made effective the class AdvancedSequencer

Hi Jeff, I worked with your library for a my private project and made some improvements to it. So I thought they could be added.
The first commit is a little rearrangement of the MIDISequencer class: some attributes (tempobpm, timesig_numerator, timesig_denominator) were moved from the track status to the sequencer status.
In the second commit there are the major changes: I rearranged the files AdvancedSequencer.cpp and its header and obtained a complete AdvancedSequencer class. I also wrote a DOS test program showing its features.
In the third commit I made some improvement to the MIDIDriverWin32 class and added a Windows sample program.
The coding is somewhat chaotic, because I leaved the old code commented. Of course when all is OK I can polish it and make some doxygen comment.
Thanks for your attention. You can contact me at ncassettaATtiscaliDOTit
Nicola Cassetta, Rome (Italy)
P.S I am not a professional developer, but rather a CPP enthusiast! So if I made some naivete let me know.