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A signal emitted when an entity is added to this world.
A signal emitted when an entity in this world has changed (usually this means components
have been added to or removed from the entity).
A signal emitted when an entity in this world which was enabled becomes disabled.
A signal emitted when an entity in this world which was disabled becomes enabled.
A signal emitted when an entity is removed from the world.
Adds the specified component to this entity.
Adds the supplied components to this entity.
Adds the specified components to this entity.
Creates and returns an entity.
Returns the entity with the specified id.
Removes the specified component from this entity.
Creates an entity with the specified id and component bitvec.
Returns an iterator over all entities in the world.