Delete trees that are not in a forest resource area (To use with Ronyx69's resource from texture scripts)

ReleaseNonForestTrees.cs

var trees = TreeManager.instance.m_trees.m_buffer;
for (uint i = 0; i < trees.Length; i++)
{
    var data = trees[i];
    if (data.m_flags == (ushort)TreeInstance.Flags.None || data.Info == null) continue;
    byte density;
    NaturalResourceManager.instance.CheckForest(data.Position, out density);
    double randomValue = Math.Round(UnityEngine.Random.value * 100, 0, MidpointRounding.AwayFromZero);
    if (randomValue <= density || density == 0)
    {
        InstanceID id = default(InstanceID);
        id.Tree = i;
        ColossalFramework.Singleton<InstanceManager>.instance.ReleaseInstance(id);
        data.m_flags |= 2;
        //UpdateTree detour
        if ((data.m_flags & 1) == 0)
        {
            return;
        }
        UnityEngine.Vector3 position = data.Position;
        TreeInfo info = data.Info;
        if (info == null)
        {
            return;
        }
        if (info.m_createRuining)
        {
            float minX = position.x - 4f;
            float minZ = position.z - 4f;
            float maxX = position.x + 4f;
            float maxZ = position.z + 4f;
            TerrainModify.UpdateArea(minX, minZ, maxX, maxZ, false, true, false);
        }
        //Singleton<NaturalResourceManager>.instance.TreesModified(position); <- this was updating resources
        //
        if ((data.m_flags & 64) != 0)
        {
            int num = Singleton<TreeManager>.instance.m_burningTrees.m_size - 1;
            for (int j = 0; j <= num; j++)
            {
                if (Singleton<TreeManager>.instance.m_burningTrees.m_buffer[j].m_treeIndex == j)
                {
                    Singleton<TreeManager>.instance.m_burningTrees.m_buffer[j] = Singleton<TreeManager>.instance.m_burningTrees.m_buffer[num];
                    Singleton<TreeManager>.instance.m_burningTrees.m_buffer[num] = default(TreeManager.BurningTree);
                    Singleton<TreeManager>.instance.m_burningTrees.m_size = num;
                    break;
                }
            }
        }
        data.m_flags = 0;
        //FinalizeTree invocation
        var args = new object[] { data, data };
        var argTypes = new Type[] { data.GetType(), data.GetType() };
        var methodInfo = TreeManager.instance.GetType().GetMethod("FinalizeTree",
        System.Reflection.BindingFlags.IgnoreCase | System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Static,
        null,
        argTypes,
        null);
        methodInfo.Invoke(TreeManager.instance, args);
        //
        Singleton<TreeManager>.instance.m_trees.ReleaseItem(i);
        Singleton<TreeManager>.instance.m_treeCount = (int)(Singleton<TreeManager>.instance.m_trees.ItemCount() - 1u);
    }
}