Next level Shlwapi (part2)

["Guy L. Albertelli" <galberte@neo.lrun.com>]

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

  dlls/shlwapi/path.c
    - Fix PathIsURL{A|W}.
    - Implement PathRenameExtension{A|W}.

  dlls/shlwapi/reg.c
    - Implement SHRegDuplicateHKey.

  dlls/shlwapi/string.c
    - Implement ChrCmpI{A|W}.

  dlls/shlwapi/shlwapi.spec
    - Forward to DrawTextW, CreateDialogParamA, CreateFontW,
      TracePopupMenuEx.
    - Implement other new/corrected entry points.

Attachment: shlwapi-path8.diff
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Attachment: shlwapi-reg8.diff
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Attachment: shlwapi-string8.diff
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Attachment: shlwapi-spec8.diff
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