'libs/ardour' - DLL visibility stuff and associated changes needed for building with MSVC. Currently includes debugging information and things that are just commented out until we have known compatibility with the other platforms (i.e. contains stuff to be removed at a later date)
'libs/ardour' - Remove the old 'visibility.h' (so as not to merge it into cairocanvas)
'libs/ardour' - Non-visibility stuff changed for MSVC (mostly alterations to #include paths)