Passenger are wrongly sent to other players

[Postremus]

The passengers do net appear to be correctly sent in every case.

To reproduce

1. Join with multiple accounts
2. Let account 1 enter a boat, and leave the boat again

Account 2 will see account 1 still sitting in the boat.

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[notourist]

I did some more testing:

• If player 1 joins first and player 2 second, player 2 is able to see player 1 leave the vehicle. But if player 2 leaves the vehicle, player 1 won't see this.
• If the bugged player + vehicle is destroyed, the player gets reset to the vehicles location, just like you would expect.
• The bugged player can enter other vehicles, but also can't leave them.
• As far as I can see, it doesn't matter who placed the vehicle.
• SteerVehicleHandler#handle is NOT fired for the bugged player. I don't know much about Netty/Glowstone's network internals, but this doesn't seem right (because only here GlowEntity#leaveVehicle is used).

Commit: 48cfdfa
Branch: dev