Remove wx/{dc,tokenzr,tglbtn,statusbr,simplebook}.h from *.h

src/commands/AudacityCommand.h

@@ -20,7 +20,6 @@
 #include <wx/defs.h>
 #include <wx/dynarray.h>
 #include <wx/intl.h>
-#include <wx/tglbtn.h>
 
 class wxListBox;
 class wxWindow;

src/commands/CommandTargets.h

@@ -57,12 +57,13 @@ and sends it to that message target.
 
 #include "../MemoryX.h"
 #include <vector>
-#include <wx/statusbr.h>
 //#include "../src/Project.h"
 #include "../widgets/ProgressDialog.h"
 #include "../commands/ResponseQueue.h"
 #include "../widgets/ErrorDialog.h"
 
+class wxStatusBar;
+
 /// Interface for objects that can receive command progress information
 class CommandProgressTarget /* not final */
 {