* long term feature: templated generic vm

* long term feature: shared_ptr less locator

* long term feature: shared_ptr less resource cache

* custom allocators and EnTT allocator-aware in general (long term feature, I don't actually need it at the moment) - see #22

* debugging tools (#60): the issue online already contains interesting tips on this, look at it

* runner proposal: https://en.wikipedia.org/wiki/Fork%E2%80%93join_model https://slide-rs.github.io/specs/03_dispatcher.html

* work stealing job system (see #100)

- mt scheduler based on const awareness for types

* meta: sort of meta view based on meta stuff to iterate entities, void * and meta info objects

* allow for built-in parallel each if possible

* allow to replace std:: with custom implementations

* remove runtime views, welcome reflection and what about snapshot?

* types defined at runtime that refer to the same compile-time type (but to different pools) are possible, the library is almost there

* add opaque input iterators to views and groups that return tuples <entity, T &...> (proxy), multi-pass guaranteed

* add fast lane for raw iterations, extend mt doc to describe allowed add/remove with pre-allocations on fast lanes

* registry.each<T...>(first, last) by iterators, entities/components guaranteed

* multi component registry::remove and some others?

* built-in support for dual (or N-) buffering

TODO

* custom (decoupled) pools ==> double buffering, shared components, multi-model

* use direct access (pool-like) also for context variables

* add take functionality, eg registry.take(entity, other); where it takes the entity and all its components from registry and move them to other

* add merge functionality, eg you have entity with A-B, and "apply" a clone from an entity with B-C. B gets replaced, C gets added, and A stays

- cloning all/part of the components are both required and a target entity on which to stomp your stuff could help

- clone is just clone, creating new entity. But yeah, both "clone-all", and "clone-components"

- for "apply", again both All and Components, and maybe an enum of what kind of apply "dont overwrite, overwrite, add-only"