slightly speed-up things by using ScTable access
slightly speed-up things by using ScTable access

Change-Id: I378cd0e1eaa0f41799e4e18d1daae813540da77d

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core