rest of change to right click on MIDI note: remove channel selector cruft from canvas note event
forward port VST parameter name fix from mixbus: some/many VST plugins expect the buffer passed to them to be zero-filled, not just null-at-start. without this they can return garbage strings for parameter names
remove unused virtual event handlers from PluginUIWindow
move CloseAllDialogs signal and associated method from ArdourDialog to ARDOUR_UI, and make ArdourWindow obey it too
VisibilityTracker needs to inherit from sigc::tracker so that it can be used without combination with other sigc::trackable parents; fix partially_visible() logic
VisibilityTracker needs to inherit from sigc::tracker so that it can be used without combination with other sigc::trackable parents; fix partially_visible() logic
the big rework of window management. probably not complete at thsi point, but this is mostly functional
merge with master