Add option to export Live2D Cubism models

AssetStudioUtility/CubismLive2DExtractor/ImportedKeyframedAnimation.cs

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+using System.Collections.Generic;
+
+namespace CubismLive2DExtractor
+{
+    public class ImportedKeyframedAnimation
+    {
+        public string Name { get; set; }
+        public float SampleRate { get; set; }
+        public float Duration { get; set; }
+
+        public List<ImportedAnimationKeyframedTrack> TrackList { get; set; } = new List<ImportedAnimationKeyframedTrack>();
+        public List<ImportedEvent> Events = new List<ImportedEvent>();
+
+        public ImportedAnimationKeyframedTrack FindTrack(string name)
+        {
+            var track = TrackList.Find(x => x.Name == name);
+            if (track == null)
+            {
+                track = new ImportedAnimationKeyframedTrack { Name = name };
+                TrackList.Add(track);
+            }
+            return track;
+        }
+    }
+
+    public class ImportedKeyframe<T>
+    {
+        public float time { get; set; }
+        public T value { get; set; }
+        public T inSlope { get; set; }
+        public T outSlope { get; set; }
+        public float[] coeff { get; set; }
+
+        public ImportedKeyframe(float time, T value, T inSlope, T outSlope, float[] coeff)
+        {
+            this.time = time;
+            this.value = value;
+            this.inSlope = inSlope;
+            this.outSlope = outSlope;
+            this.coeff = coeff;
+        }
+
+        public float Evaluate(float sampleTime)
+        {
+            float t = sampleTime - time;
+            return (t * (t * (t * coeff[0] + coeff[1]) + coeff[2])) + coeff[3];
+        }
+    }
+
+    public class ImportedAnimationKeyframedTrack
+    {
+        public string Name { get; set; }
+        public string Target { get; set; }
+        public List<ImportedKeyframe<float>> Curve = new List<ImportedKeyframe<float>>();
+    }
+
+    public class ImportedEvent
+    {
+        public float time { get; set; }
+        public string value { get; set; }
+    }
+}