wxWidgets toolbar fixes
- moving ToggleMouse() call to the gui thread fixes two issue: possible deadlock
  in wxGTK after showing message box, mouse cursor not hidden in wxMSW
- don't add undefined toolbar events to the queue
- removed unused / unhandled cases from the toolbar code


git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12099 6c8e4198-a580-4521-a02f-c9ae86df1db9