Clean: remove deprecated Pool api - they've stayed 1 year longer than supposed to
- replaced internal usages
* Pool.GetList<T> -> use Pool.Get<List<T>> instead
* Pool.FreeList<T> -> Pool.FreeUnmanaged
* Pool.FreeListAndItems<T> -> Pool.Free(ref obj, true)
* Pool.ClearList<T> -> write your own
* Pool.FreeMemoryStream -> Pool.FreeUnmanaged
Tests: compile simulator in editor