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

include/wx/listbase.h

@@ -410,6 +410,13 @@ public:
 
     // All these methods can only be used in report view mode.
 
+    // Appends a new column.
+    //
+    // Returns the index of the newly inserted column or -1 on error.
+    long AppendColumn(const wxString& heading,
+                      int format = wxLIST_FORMAT_LEFT,
+                      int width = -1);
+
     // Add a new column to the control at the position "col".
     //
     // Returns the index of the newly inserted column or -1 on error.