add more structure types

Project/Assets/ML-Agents/Examples/FPS_Game/Prefabs/Projectile.prefab

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Project/Assets/ML-Agents/Examples/SharedAssets/Materials/GridMatMoveable.mat

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Project/Assets/ML-Agents/Examples/SharedAssets/Materials/Projectile.mat

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Project/Assets/ML-Agents/Examples/SharedAssets/Materials/Projectile.mat.meta

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