Add convenient wxListCtrl::AppendColumn() wrapper.

In the vast majority of cases, columns are just appended to the end and not
inserted at arbitrary positions in wxListCtrl so provide a convenient wrapper
to do this, especially as it's really trivial to do it now when it can be done
only once at wxListCtrlBase level.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70283 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/listctrl.h

@@ -197,6 +197,19 @@ public:
     */
     virtual ~wxListCtrl();
 
+    /**
+        Adds a new column to the list control in report view mode.
+
+        This is just a convenient wrapper for InsertColumn() which adds the new
+        column after all the existing ones without having to specify its
+        position explicitly.
+
+        @since 2.9.4
+     */
+    long AppendColumn(const wxString& heading,
+                      int format = wxLIST_FORMAT_LEFT,
+                      int width = -1);
+
     /**
         Arranges the items in icon or small icon view.
         This only has effect on Win32. @a flag is one of: