EntityEvents and EntitySpawner used to work independently of each other, with separate IDs, and there was no guarantee that spawning and events would happen in the correct order. For example, a client could fail to read events during midround syncing because the entity has been removed, or read an event for an incorrect entity because the entity has been removed and the ID taken by some other entity.
Looks like a lot more than just netcode is getting rewritten. Removing coroutines because there are better ways of handling asynchronous tasks, removing filestream because that's to be reimplemented later
