Global querying #3
Description
Currently queries are limited to single explicitly listed archetypes, but there should be an option to do querying like in a typical ECS: querying all kinds of entities with the specified components.
Problems:
- Components are not type-unique, but path-unique; so how do we properly query components across multiple archetypes?
- Now we need another derive macro for the World to have easy access to all archetypes when querying.