Server wide vote on extending round/shift on RP server

[Superlagg]

Ya know, this might also be a good thing on the non-RP servers too. A vote to respawn all the dead people and continue the round after the shuttle returns. Sometimes, the shuttle is called just because everyone's dead or the captain didnt roll antag, and there's still a mostly intact station left behind.

Not just saying this cus I coded something that does roughly this.