unify rw interfaces

...botAPI/libraries/GraspingUtility/GraspCandidateReader.cpp

...RobotAPI/libraries/GraspingUtility/GraspCandidateReader.h

...botAPI/libraries/GraspingUtility/GraspCandidateWriter.cpp

...RobotAPI/libraries/GraspingUtility/GraspCandidateWriter.h

...RobotAPI/libraries/armem/client/util/SimpleReaderBase.cpp

...e/RobotAPI/libraries/armem/client/util/SimpleReaderBase.h

...RobotAPI/libraries/armem/client/util/SimpleWriterBase.cpp

...e/RobotAPI/libraries/armem/client/util/SimpleWriterBase.h

...tAPI/libraries/armem_laser_scans/client/common/Reader.cpp

...botAPI/libraries/armem_laser_scans/client/common/Reader.h

...tAPI/libraries/armem_laser_scans/client/common/Writer.cpp

...botAPI/libraries/armem_laser_scans/client/common/Writer.h