Unify retrieving file/dir attributes when file handle is open

Currently CH uses FindFirstFileEx to retrieve updated file information about file, even if the file handle is already open.
Information retrieved using FindFirstFile/FindNextFile might be out-of-date in case of NTFS filesystem (https://msdn.microsoft.com/en-us/library/windows/desktop/aa364418%28v=vs.85%29.aspx). It should be more efficient to get information using the opened handle. Also the information retrieved from handle will be more up-to-date.