Add and use typedef for entity info retrieval function

source/RobotAPI/libraries/armem_gui/MemoryViewer.cpp

...ce/RobotAPI/libraries/armem_gui/instance/InstanceView.cpp

source/RobotAPI/libraries/armem_gui/memory/GroupBox.cpp

source/RobotAPI/libraries/armem_gui/memory/GroupBox.h

...ibraries/armem_gui/prediction_widget/PredictionWidget.cpp

.../libraries/armem_gui/prediction_widget/PredictionWidget.h