Add option to export Live2D Cubism models

AssetStudioUtility/CubismLive2DExtractor/CubismPhysicsRig.cs

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+using AssetStudio;
+
+namespace CubismLive2DExtractor
+{
+    public class CubismPhysicsNormalizationTuplet
+    {
+        public float Maximum;
+        public float Minimum;
+        public float Default;
+    }
+
+    public class CubismPhysicsNormalization
+    {
+        public CubismPhysicsNormalizationTuplet Position;
+        public CubismPhysicsNormalizationTuplet Angle;
+    }
+
+    public class CubismPhysicsParticle
+    {
+        public Vector2 InitialPosition;
+        public float Mobility;
+        public float Delay;
+        public float Acceleration;
+        public float Radius;
+    }
+
+    public class CubismPhysicsOutput
+    {
+        public string DestinationId;
+        public int ParticleIndex;
+        public Vector2 TranslationScale;
+        public float AngleScale;
+        public float Weight;
+        public CubismPhysicsSourceComponent SourceComponent;
+        public bool IsInverted;
+    }
+
+    public enum CubismPhysicsSourceComponent
+    {
+        X,
+        Y,
+        Angle,
+    }
+
+    public class CubismPhysicsInput
+    {
+        public string SourceId;
+        public Vector2 ScaleOfTranslation;
+        public float AngleScale;
+        public float Weight;
+        public CubismPhysicsSourceComponent SourceComponent;
+        public bool IsInverted;
+    }
+
+    public class CubismPhysicsSubRig
+    {
+        public CubismPhysicsInput[] Input;
+        public CubismPhysicsOutput[] Output;
+        public CubismPhysicsParticle[] Particles;
+        public CubismPhysicsNormalization Normalization;
+    }
+
+    public class CubismPhysicsRig
+    {
+        public CubismPhysicsSubRig[] SubRigs;
+        public Vector2 Gravity = new Vector2(0, -1);
+        public Vector2 Wind;
+    }
+
+    public class CubismPhysics
+    {
+        public string m_Name;
+        public CubismPhysicsRig _rig;
+    }
+}