BUG 54771 extract text from SDTs at the cell level within a table row

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1602955 13f79535-47bb-0310-9956-ffa450edef68
BUG 54771: add class to svn

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1602960 13f79535-47bb-0310-9956-ffa450edef68