Add and implement part of mns::Client

source/RobotAPI/libraries/armem/CMakeLists.txt

source/RobotAPI/libraries/armem/core/error.h

source/RobotAPI/libraries/armem/core/error/ArMemError.cpp

source/RobotAPI/libraries/armem/core/error/ArMemError.h

source/RobotAPI/libraries/armem/core/error/mns.cpp

source/RobotAPI/libraries/armem/core/error/mns.h

source/RobotAPI/libraries/armem/mns/Client.cpp

source/RobotAPI/libraries/armem/mns/Client.h

source/RobotAPI/libraries/armem/mns/ClientPlugin.cpp

source/RobotAPI/libraries/armem/mns/ClientPlugin.h