TODO 589 B

123456
  1. * FilteredView (decorator with a member method that accepts a filter function to apply to the entities returned by the underlying view)
  2. * custom allocators and EnTT allocator-aware in general (long term feature, I don't actually need it at the moment) - see #22
  3. * to analyze, long term feature: systems organizer based on dependency graphs for implicit parallelism (I don't want to think anymore in future :-))
  4. * save/restore functionalities - see #27
  5. * parent-child relationships between entities directly managed by the registry. is it possible to do that in a clean and safe way?
  6. * AOB