[SHELL32] SHBrowseForFolder: Refactor brsfolder.c (#6903)

dll/win32/shell32/wine/brsfolder.c.
This file is too hard to read. Nobody reads.
And WineHQ doesn't show no progress
recently in this file. OUT OF DATE!
JIRA issue: CORE-17340
- Rewrite some SendMessageW code by
  using TreeView_... macros.
- Add BrsFolder_GetDataFromItem helper
  function and use it.