readGroupLogInfo reads the first info and gains struct
  from a binary .hebilog file
 
    This method will return empty if the log does not contain
    any info or log data.
 
    Example:
        [info, gains, safetyParams] = HebiUtils.readGroupLogInfo(path);
 
    Example:
        % Get info for all logs selected via a GUI
        fileNames = HebiUtils.convertGroupLogsUI('format','raw');
        [infos, gains, safetyParams] = cellfun(@HebiUtils.readGroupLogInfo, ...
            fileNames, 'UniformOutput', false);