Gets all the ISpaceInstances that were stared within the processing unit instance.
Will return an empty list if no space instances were started within this processing unit (or none has
been detected yet).

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IList<ISpaceInstance> SpaceInstances { get; }
ReadOnly Property SpaceInstances As IList(Of ISpaceInstance)
property IList<ISpaceInstance^>^ SpaceInstances { IList<ISpaceInstance^>^ get (); }
/** @property */ IList<ISpaceInstance> get_SpaceInstances()