Switch points generation from managed thread to unmanaged thread; Change Spline to NativeSpline; Add converter for DistributionMode and update cloner editor ui; Add MeshData type for object distribution calculation; Add ObjectDistributionSetting and ObjectDistributionCalculation(Vertex and Edge Mode);

Runtime/Cloner/Enums/ObjectDistributionMode.cs

@@ -0,0 +1,11 @@
+namespace Misaki.ArtTool
+{
+    public enum ObjectDistributionMode
+    {
+        Surface,
+        Volume,
+        Vertex,
+        Edge,
+        PolygonCenter
+    }
+}