Remove redundant #include-s from .h files...

Redundant, because transitively implied.  But don't do this for inclusions of
Audacity.h or Experimental.h.

src/widgets/AButton.h

@@ -12,7 +12,6 @@
 #ifndef __AUDACITY_BUTTON__
 #define __AUDACITY_BUTTON__
 
-#include "../MemoryX.h"
 #include <vector>
 
 #include <wx/setup.h> // for wxUSE_* macros

src/widgets/ASlider.h

@@ -13,7 +13,6 @@
 #ifndef __AUDACITY_SLIDER__
 #define __AUDACITY_SLIDER__
 
-#include "../MemoryX.h"
 #include <wx/setup.h> // for wxUSE_* macros
 #include <wx/defs.h>
 #include <wx/timer.h> // member variable

src/widgets/BackedPanel.h

@@ -9,7 +9,6 @@
 #ifndef __AUDACITY_BACKED_PANEL__
 #define __AUDACITY_BACKED_PANEL__
 
-#include "../MemoryX.h"
 #include <wx/dcmemory.h> // member variable
 #include "wxPanelWrapper.h" // to inherit
 

src/widgets/ExpandingToolBar.h

@@ -11,7 +11,6 @@
 #ifndef __AUDACITY_EXPANDING_TOOL_BAR__
 #define __AUDACITY_EXPANDING_TOOL_BAR__
 
-#include "../MemoryX.h"
 #include <vector>
 #include <wx/defs.h>
 #include <wx/dragimag.h> // use macros and typedefs in this header
@@ -19,7 +18,6 @@
 #include <wx/minifram.h> // to inherit
 
 #include "ImageRoll.h"
-#include "wxPanelWrapper.h" // to inherit
 
 #include <unordered_map>
 

src/widgets/Grid.h

@@ -11,13 +11,11 @@
 #ifndef __AUDACITY_WIDGETS_GRID__
 #define __AUDACITY_WIDGETS_GRID__
 
-#include "../MemoryX.h"
 #include <vector>
 #include <wx/setup.h> // for wxUSE_* macros
 #include <wx/defs.h>
 #include <wx/grid.h> // to inherit wxGridCellEditor
 #include "NumericTextCtrl.h"
-#include "../Internat.h"
 
 #if wxUSE_ACCESSIBILITY
 class GridAx;

src/widgets/ProgressDialog.h

@@ -20,7 +20,6 @@
 
 #include "../Audacity.h"
 
-#include "../MemoryX.h"
 #include <vector>
 #include <wx/defs.h>
 #include <wx/evtloop.h> // member variable