Work State Serialization

- Worked on serialization issues (some string data doesn't get correctly formatted, but was also not needed, so removed the data part from ScenePartition)
- Moved some files to runtime (wip)

Runtime/SceneGrid.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace VertexColor.ScenePartition.Editor
+{
+    [Serializable]
+    public class SceneGrid
+    {
+        [SerializeField]
+        private int cellSize = 10;
+
+        [SerializeField]
+        private SceneGridDictionary grid = new SceneGridDictionary();
+
+        public void Insert(uint id, Vector2 point)
+        {
+            Vector2 gridPos = CalculateGridPosition(point);
+            if (grid.TryGetValue(gridPos, out List<uint> ids))
+            {
+                ids.Add(id);
+            }
+            else
+            {
+                grid.Add(gridPos, new List<uint> { id });
+            }
+        }
+
+        public Vector2 CalculateGridPosition(Vector2 point)
+        {
+            int x = Mathf.FloorToInt(point.x / cellSize);
+            int y = Mathf.FloorToInt(point.y / cellSize);
+
+            return new Vector2(x, y);
+        }
+    }
+}