More Toolbar fixes

[Guy L. Albertelli]

This change makes IE4 able to do the "Favorites" menu dropdown folder
pop-outs. With the notify, the folder will be automatically expanded just
like the native control.

This does not fix IE5.x however. See associated message on wine-devel for
details.

Guy Albertelli  <<galberte at neo.lrun.com>>

  dlls/comctl32/toolbar.c
   - Improve I_IMAGECALLBACK handling and support
      I_IMAGENONE.
   - Implement TBN_HOTITEMCHANGE in the mouse move
     routine.
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