Remove Tags.h, Grid.h from headers

src/prefs/ExtImportPrefs.cpp

@@ -24,6 +24,7 @@
 #include "../Prefs.h"
 #include "../ShuttleGui.h"
 #include "../widgets/ErrorDialog.h"
+#include "../widgets/Grid.h"
 
 #define EXTIMPORT_MIME_SUPPORT 0
 

src/prefs/ExtImportPrefs.h

@@ -13,7 +13,6 @@
 
 #include <wx/defs.h>
 #include <wx/dnd.h> // to inherit wxDropTarget
-#include "../widgets/Grid.h"
 
 #include "PrefsPanel.h"
 
@@ -21,9 +20,12 @@
 #include "../import/ImportPlugin.h"
 
 class wxButton;
+class wxGridEvent;
+class wxGridRangeSelectEvent;
 class wxListCtrl;
 class wxListEvent;
 class ExtImportPrefs;
+class Grid;
 class ShuttleGui;
 
 class ExtImportPrefsDropTarget final : public wxDropTarget