resend USER32: result of ScrollBar functions review

[Vitaly Lipatov]

Resend patch.

ChangeLog
  implemented SCROLLBARINFO struct
  implemented SBM_GETSCROLLBARINFO message
  implemented GetScrollBarInfo function
  fix scrollbar show/update conditions
  add isShow flag in SCROLLBAR_INFO
  rename, separate and rewrite SCROLL_GetScrollBarInfo in to
SCROLL_GetInternalInfo and SCROLL_NewInternalInfo functions

--
Vitaly Lipatov, ALT Linux Team
Russia, Saint-Petersburg, www.etersoft.ru
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