Compiled queries #3
Description
Later I might want to speed up queries by not discarding the entities after they're used.
In theory a query could register itself with the world holding into its entities and leaving info on how adding or removing components would affect that entities placement in that query. Like saying that removing a component will always remove it from a query and adding that component might add it back into the query, so only entities which may be added will need to be checked if the query is used.