concrete implementation for serialization, not needed starting unity 2020.1 
 
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void  | StartDeliver (MonoBehaviour owner, ItemStorage storage, Vector2Int? accessPoint) | 
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void  | StartDeliver (MonoBehaviour owner, ItemStorage storage, ItemQuantity items, Vector2Int? accessPoint) | 
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void  | Spawn (Action< T > onSpawned=null, Vector2Int? start=null) | 
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void  | Spawn< Q, P > (MonoBehaviour owner, Func< Q > preparer, Func< Q, P > planner, Action< T, P > spawner=null, Action< T > onSpawned=null, Vector2Int? start=null) | 
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ManualWalkerSpawnerData  | SaveData () | 
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void  | LoadData (ManualWalkerSpawnerData data) | 
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