Kicking should remove entities that the kicked user created, not owned

[brianpeiris]

We introduced kicking in #861 but that implementation removes all entities for with the kicked user is currently the owner. Instead, we should keep store creator client ids when entities are spawned and remove only the objects that the kicked user created, not the ones they currently own.

This applies to pinned entities as well -- if a kicked user pinned an object that another user created, the entity should not be removed