Added IMapDataGenerator interface

Runtime/IMapDataGenerator.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace KairoEngine.Core
+{
+    public interface IMapDataGenerator
+    {
+        public float SamplePoint(float x, float y);
+        public uint SamplePointColor(float x, float y, float value);
+    }
+}

Runtime/IMapDataGenerator.cs.meta

@@ -0,0 +1,11 @@
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