Allow Disk LTM to either load multiple or a single stored memory

...ce/RobotAPI/libraries/armem/server/MemoryToIceAdapter.cpp

.../armem/server/ltm/base/converter/image/png/PngConverter.h

...braries/armem/server/ltm/base/detail/BufferedMemoryBase.h

.../libraries/armem/server/ltm/base/detail/CoreSegmentBase.h

...otAPI/libraries/armem/server/ltm/base/detail/EntityBase.h

...braries/armem/server/ltm/base/detail/EntitySnapshotBase.h

...otAPI/libraries/armem/server/ltm/base/detail/MemoryBase.h

...API/libraries/armem/server/ltm/base/detail/MemoryItem.cpp

...otAPI/libraries/armem/server/ltm/base/detail/MemoryItem.h

...raries/armem/server/ltm/base/detail/ProviderSegmentBase.h

.../RobotAPI/libraries/armem/server/ltm/disk/CoreSegment.cpp

...ce/RobotAPI/libraries/armem/server/ltm/disk/CoreSegment.h

source/RobotAPI/libraries/armem/server/ltm/disk/Entity.cpp

source/RobotAPI/libraries/armem/server/ltm/disk/Entity.h

...botAPI/libraries/armem/server/ltm/disk/EntitySnapshot.cpp

...RobotAPI/libraries/armem/server/ltm/disk/EntitySnapshot.h

source/RobotAPI/libraries/armem/server/ltm/disk/Memory.cpp

source/RobotAPI/libraries/armem/server/ltm/disk/Memory.h

...otAPI/libraries/armem/server/ltm/disk/ProviderSegment.cpp

...obotAPI/libraries/armem/server/ltm/disk/ProviderSegment.h