#473 Exception System.ArgumentNullException thrown in .NET standard 2.1
#457 make XWPFTable.GetCTTbl public
#464 Missing 'Spacing after' property when 'Line spacing' property settled
#408 Wrong calculation of IFERROR and Match function
#436 Empty cells are skipped while using SXSSF objects
#404 Bug Fix: Paragraph ReplaceText/SearchText In Several Runs
#435 SXSSFWorkbook possible performance overhead
#450 fix XSSFSheet.RemoveRow bug