Fix spelling in comments and documentation using codespell

Apply the utility from https://github.com/codespell-project/codespell/
to fix spelling issues in the headers under both include and interface
directories and add a file with a couple of exceptions.

The exact command line used was:

    $ codespell -w -I misc/scripts/codespell.ignore -i 3 in*

include/wx/treebook.h

@@ -195,7 +195,7 @@ private:
     // from m_tree (wxTreeCtrl) component.
     int DoInternalFindPageById(wxTreeItemId page) const;
 
-    // Updates page and wxTreeItemId correspondance.
+    // Updates page and wxTreeItemId correspondence.
     void DoInternalAddPage(size_t newPos, wxWindow *page, wxTreeItemId pageId);
 
     // Removes the page from internal structure.