One more round of effects changes.

The big thing is the common efffects UI.  Right now Ladspa and VST
have been converted to use it and Audiounits will be next.  It makes
everything nice and consistent while reducing the clutter in the
dialog.

Other goodies are:

Ladspa effects now show output controls when supplied by the effect
Ladspa effects now work fine as Analyze type effects
Ladspa now has user presets
VST effects dialog is now less cluttered...leaving more room for the effect
Ladspa and VST effects now share a common UI
Ladspa and VST effects are now usable in chains
Ladspa and VST effects now handle user presets the same way
Currently active effects settings automatically saved and reloaded
Can now do numeric range checking on input fields.

And, as always, plenty of critter squashing.

src/AudacityApp.cpp

@@ -645,7 +645,7 @@ IMPLEMENT_APP(AudacityApp)
 
 #ifdef __WXMAC__
 // This should be removed when Lame and FFmpeg support is converted
-// from loadable libraries to commands.mLogger
+// from loadable libraries to commands.
 //
 // The purpose of this is to give the user more control over where libraries
 // such as Lame and FFmpeg get loaded from.
@@ -1008,7 +1008,6 @@ int AudacityApp::FilterEvent(wxEvent & event)
    return -1;
 }
 #endif
-#include "effects/VST/VSTEffect.h"
 
 // The `main program' equivalent, creating the windows and returning the
 // main frame