Constify some OUStrings and avoid some appends
Constify some OUStrings and avoid some appends

Change-Id: Id90d02bab3c3a3b3e2e59097fdf741e2de2b331c

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