Fix EntitySnapshot ctors and ops

...e/RobotAPI/libraries/armem/core/base/EntitySnapshotBase.h

...PI/libraries/armem/core/base/detail/MemoryContainerBase.h

...botAPI/libraries/armem/core/diskmemory/EntitySnapshot.cpp

...RobotAPI/libraries/armem/core/diskmemory/EntitySnapshot.h

...PI/libraries/armem/core/longtermmemory/EntitySnapshot.cpp

...tAPI/libraries/armem/core/longtermmemory/EntitySnapshot.h

...API/libraries/armem/core/workingmemory/EntitySnapshot.cpp

...otAPI/libraries/armem/core/workingmemory/EntitySnapshot.h

source/RobotAPI/libraries/armem/test/ArMemMemoryTest.cpp