remove BitMask

src/Utils/BitMask.cs

@@ -1,38 +0,0 @@
-using System;
-
-namespace DCFApixels.DragonECS
-{
-    public class BitMask
-    {
-        private int[] data;
-
-        public int Length { get; private set; }
-
-        public BitMask(int length)
-        {
-            Length = length;
-            data = new int[(length + 31) / 32];
-        }
-
-        public void Resize(int newLength)
-        {
-            Length = newLength;
-            Array.Resize(ref data, (newLength + 31) / 32);
-        }
-
-        public void Set1(int index)
-        {
-            data[index / 32] |= 1 << (index % 32);
-        }
-
-        public void Set0(int index)
-        {
-            data[index / 32] &= ~(1 << (index % 32));
-        }
-
-        public bool Get(int index)
-        {
-            return (data[index / 32] & (1 << (index % 32))) != 0;
-        }
-    }
-}

src/Utils/BitMask.cs.meta

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