Entity spawn prediction v2

[metalgearsloth]

trafficstars

Discord thread here https://discord.com/channels/310555209753690112/1361697552034037867

Essentially the issue is if the client predicts the entity, then interacts with it the server has no knowledge of the entity (and client can't predict what its nentity will be). We need some way to get a consistent hash between client and server, then content needs updating to use the new method (e.g. interactionsystem).