Treeview hack for IE5.5

[Guy L. Albertelli]

WARNING:
This is a hack. The entire control needs to be restructured to properly
implement Unicode strings. Currently all strings are stored in ASCII. In the
interest of getting IE5.5 running better, I have implemented the Unicode
format notifies (except for the EDITLABEL ones). IE5.5's favorites button
now produces the proper panel. Mouse clicks in it are still problematical.

I have tested it against IE4 also and that still works (even better with the
TVS_NOSCROLL code).

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

  dlls/comctl32/treeview.c
   - Preliminary implementation of TVS_NOSCROLL and
     TVS_NOHSCROLL
   - Implement A and W versions of WM_NOTIFY based on
     response to WM_NOTIFYFORMAT. Note that the
     EDITLABEL notifies are not done.
   - Implement WM_NOTIFYFORMAT.
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