去掉obi，使用自写绳索

Assets/Obi/Scripts/Common/Backends/Burst/DataStructures/BurstCellSpan.cs

@@ -1,60 +0,0 @@
-#if (OBI_BURST && OBI_MATHEMATICS && OBI_COLLECTIONS)
-using UnityEngine;
-using Unity.Mathematics;
-using System.Collections;
-using System;
-
-namespace Obi
-{
-    public struct BurstCellSpan : IEquatable<BurstCellSpan>
-    {
-        public int4 min;
-        public int4 max;
-
-
-        public BurstCellSpan(CellSpan span)
-        {
-            this.min = new int4(span.min.x, span.min.y, span.min.z, span.min.w);
-            this.max = new int4(span.max.x, span.max.y, span.max.z, span.max.w);
-        }
-
-        public BurstCellSpan(int4 min, int4 max)
-        {
-            this.min = min;
-            this.max = max;
-        }
-
-        public int level
-        {
-            get{return min.w;}
-        }
-
-        public bool Equals(BurstCellSpan other)
-        {
-            return min.Equals(other.min) && max.Equals(other.max);
-        }
-
-        public override bool Equals(object obj)
-        {
-            return this.Equals((BurstCellSpan)obj);
-        }
-
-        public override int GetHashCode()
-        {
-            return 0; // we don't have any non-mutable fields, so just return 0.
-        }
-
-        public static bool operator ==(BurstCellSpan a, BurstCellSpan b)
-        {
-            return a.Equals(b);
-        }
-
-        public static bool operator !=(BurstCellSpan a, BurstCellSpan b)
-        {
-            return !a.Equals(b);
-        }
-
-
-    }
-}
-#endif