integrated option for resetting the robot before executing the subtask

.../include/learn_environment/folder_structure_constants.hpp

...n_environment/include/learn_environment/script_worker.hpp

.../src/learn_environment/include/learn_environment/task.hpp

...n_environment/include/learn_environment/task_executor.hpp

...rn_environment/include/learn_environment/task_manager.hpp

catkin_ws/src/learn_environment/src/process_runner.cpp

catkin_ws/src/learn_environment/src/script_worker.cpp

catkin_ws/src/learn_environment/src/task_executor.cpp

catkin_ws/src/learn_environment/src/task_manager.cpp

catkin_ws/src/learn_environment/src/task_parser.cpp

catkin_ws/src/learn_environment/task_pool/reset_robot.py

..._ws/src/learn_environment/task_pool/task_definitions.json