Continue operand encoding normalization.

include/interfaces/abstract/STARSOp.h

include/interfaces/idapro/STARSOp.h

include/interfaces/irdb/STARSOp.h

src/base/SMPInstr.cpp

src/interfaces/abstract/STARSOp.cpp

src/interfaces/idapro/STARSIDAOp.cpp

src/interfaces/irdb/STARS_IRDB_Instruction.cpp