Move IndexSet to OtterGui

OtterGui

@@ -1 +1 @@
-Subproject commit f033fc9c103b8a07398481cbff00b0ad3ea749e2
+Subproject commit ebaedd64ed28032e4c9bc34c0c1ec3488b2f0937

Penumbra/Util/IndexSet.cs

@@ -1,110 +0,0 @@
-using System;
-using System.Collections;
-using System.Collections.Generic;
-
-namespace Penumbra.Util;
-
-public class IndexSet : IEnumerable<int>
-{
-    private readonly BitArray _set;
-    private int _count;
-
-    public int Capacity => _set.Count;
-
-    public int Count => _count;
-
-    public bool this[Index index]
-    {
-        get => _set[index];
-        set
-        {
-            if( value )
-            {
-                Add( index );
-            }
-            else
-            {
-                Remove( index );
-            }
-        }
-    }
-
-    public IndexSet( int capacity, bool initiallyFull )
-    {
-        _set = new BitArray( capacity, initiallyFull );
-        _count = initiallyFull ? capacity : 0;
-    }
-
-    public bool Add( Index index )
-    {
-        var ret = !_set[index];
-        if( ret )
-        {
-            ++_count;
-            _set[index] = true;
-        }
-        return ret;
-    }
-
-    public bool Remove( Index index )
-    {
-        var ret = _set[index];
-        if( ret )
-        {
-            --_count;
-            _set[index] = false;
-        }
-        return ret;
-    }
-
-    public int AddRange( int offset, int length )
-    {
-        var ret = 0;
-        for( var idx = 0; idx < length; ++idx )
-        {
-            if( Add( offset + idx ) )
-            {
-                ++ret;
-            }
-        }
-        return ret;
-    }
-
-    public int RemoveRange( int offset, int length )
-    {
-        var ret = 0;
-        for( var idx = 0; idx < length; ++idx )
-        {
-            if( Remove( offset + idx ) )
-            {
-                ++ret;
-            }
-        }
-        return ret;
-    }
-
-    public IEnumerator<int> GetEnumerator()
-    {
-        if( _count > 0 )
-        {
-            var capacity = _set.Count;
-            var remaining = _count;
-            for( var i = 0; i < capacity; ++i )
-            {
-                if( _set[i] )
-                {
-                    yield return i;
-                    if( --remaining == 0 )
-                    {
-                        yield break;
-                    }
-                }
-            }
-        }
-    }
-
-    IEnumerator IEnumerable.GetEnumerator()
-    {
-        return GetEnumerator();
-    }
-}