(unconfirmed) don't drop items from far away chunks before X minutes

[nictuku]

(this is more like a note to self)

I didn't actually test this, but unless this is handled client-side we are probably destroying all items from chunks as soon as they are unsubscribed. I didn't confirm but I believe we unsubscribe right after a player moves away from that chunk.

The desired behavior is that dropped items remain spawned for at least 5 minutes, so the player is able to recover them.