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/generic/progdlgg.h

@@ -120,7 +120,7 @@ protected:
     // called to disable the other windows while this dialog is shown
     void DisableOtherWindows();
 
-    // must be called to reenable the other windows temporarily disabled while
+    // must be called to re-enable the other windows temporarily disabled while
     // the dialog was shown
     void ReenableOtherWindows();