* Add component registration and metadata API
* Fix test case erroring
* Initial commit
* Simplify entity swap logic in world_entity function
* Allow to disconnect signals
* Remove appending to array
* Add ecs_assert and fix entity range handling
* Fix listener array indexing in observers
* Only max_id and alive_count if range_begin is larger than built in
ranges
* No nullable records
* Index is not a stable pointer
* Add nth parameter to world:target
* Put archetype record creation into function
* Fix docs and comments
* Make EcsWildcard a component
* Name the builtin components
* Sparse set for entity records
* Swap dense indexes
* Improve inlining
* Add benchmarks
* Add tests for relations
* Add REST
* Merge upstream changes
* Add back symmetric and non idempotent add function
* Only swap when not last row
* Assert that the entity is alive
* Update example with relations
