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/log.h

@@ -804,7 +804,7 @@ public:
     // change the new log target
     void SetLog(wxLog *logger);
 
-    // this can be used to temporarily disable (and then reenable) passing
+    // this can be used to temporarily disable (and then re-enable) passing
     // messages to the old logger (by default we do pass them)
     void PassMessages(bool bDoPass) { m_bPassMessages = bDoPass; }