Add pause feature

[Bios-Marcel]

If someone needs to step out for a moment and you want to wait, there's way to do so.

Similar to the readiness check, there should be some kind of pause vote. Maybe not 100% of the players should be required, given some person might already be AFK. The ready check should not show a modal dialog though. Mabye we can show a popup next to the request player? This would also require scrolling, the player list, depending on the player count.

The pause vote needs to take the tick function into account and temporarily ignore all gameplay related event types.