Fix bugs in ArMem and make disk loading and storing nicer

# Conflicts:
#	source/RobotAPI/libraries/armem/CMakeLists.txt
#	source/RobotAPI/libraries/armem/core/base/MemoryBase.h
#	source/RobotAPI/libraries/armem/core/longtermmemory/Entity.cpp
#	source/RobotAPI/libraries/armem/core/longtermmemory/Entity.h
#	source/RobotAPI/libraries/armem/core/longtermmemory/Memory.cpp
#	source/RobotAPI/libraries/armem/server/ComponentPlugin.cpp
#	source/RobotAPI/libraries/armem_gui/MemoryViewer.cpp

Merge branch 'armem/clean-up-interfaces' of https://gitlab.com/ArmarX/RobotAPI into armem/clean-up-interfaces

# Conflicts:
#	source/RobotAPI/libraries/armem/CMakeLists.txt