Redid the way SCSI and ATAPI devices are handled;
Slight timings change in the NCR 5380;
Devices are now closed by device_close_all() in the reverse order of the one in which they were started;
Slight changes to some code in win/;
Added the WM_HARDRESET and WM_SHUTDOWN window messages for configuration manager purposes.
Sound Blaster 16/AWE32 MPU-401 is now always the less-functional variant like it would be on real hardware and its IRQ is always shared with the sound card;
Standalone MPU-401 is now always the fully functional intelligent mode variant;
Standalone MPU-401 is now always available, even when Sound Blaster 16/AWE32 is in use;
Cleaned up sound/midi.c and win/win_midi.c.
IBM.H is gone, video stuff re-organized. Keyboard stuff reorganized.
Machines that have their own video, mouse and/or keyboard now have all this in their machine file.
Fixed and other cleanups here and there.
