Added object distributuon calculationg

Runtime/Cloner/Fields/ModifierLayer/Clamp.cs

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+using Unity.Mathematics;
+
+namespace Misaki.ArtTool
+{
+    public class Clamp : FieldBase
+    {
+        public float2 minMax;
+
+        public override float Operate(float3 position, float weight)
+        {
+            return math.clamp(weight, minMax.x, minMax.y);
+        }
+    }
+}

Runtime/Cloner/Fields/ModifierLayer/Clamp.cs.meta

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+fileFormatVersion: 2
+guid: 315e5886979edba429c781f6a8a0a0cc