migrate ImpNumberFill implementation to OUStringBuffer
migrate ImpNumberFill implementation to OUStringBuffer

Change-Id: Ideb89b8ced5c3ac2b07a7e270b90e92beef02aad

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