refactoring boardApp save file
refactoring boardApp save file

yona-projects/yona,naver/yobi,bloodybear/yona,naver/yobi,Limseunghwan/oss,yona-projects/yona,doortts/fork-yobi,ChangsungKim/TestRepository01,doortts/forked-for-history,brainagenet/yobi,bloodybear/yona,ihoneymon/yobi,doortts/fork-yobi,ChangsungKim/TestRepository01,naver/yobi,Limseunghwan/oss,ahb0327/yobi,brainagenet/yobi,violetag/demo,doortts/forked-for-history,oolso/yobi,doortts/fork-yobi,ihoneymon/yobi,bloodybear/yona,ahb0327/yobi,violetag/demo,oolso/yobi,oolso/yobi,brainagenet/yobi,ihoneymon/yobi,Limseunghwan/oss,doortts/forked-for-history,yona-projects/yona,bloodybear/yona,doortts/fork-yobi,ahb0327/yobi,yona-projects/yona