A lot more safety checks on the voting screen for spectators

- A new variable, voteclient.loaded, for keeping track of whenever or not voting data has been set up or not. Gets set to true in Y_StartVote, false in Y_UnloadVoteData. This is used to prevent drawing the screen in cases where it would crash, and preventing duplicate Y_EndVote calls.
- The game checks for all spectator when transitioning to vote, to decide whenever or not it should skip it entirely or not.
- Unrelated: made the roulette cheating much more common. Hopefully it's as cheaty as Mario Party now :p