End round early to prevent wait times if people leave

[Bios-Marcel]

There are two scenarios where we can end a round early.

1. The drawer leaves before choosing a word.

Having to wait two minutes for nothing is kind of annoying. No player will be at a disadvantage if we end early here.

2. If the last guessing player leaves

Similar to 1, but not as bad. Here we should be careful, that we don't necessarily count this as a negative for the drawing player. This should not reduce their overall points, as it would also not do so, if someone leaves as the second last person guessing.

Both the next-turn and game-over event should be extended with a field that indicates the round ended early due to the last guessers having disconnected. Something like earlyTurnEndDueToDisconnect.

This logic can be implemented on the tick side. There should be a sensible time-frame for allowing to reconnect.