Overrides the game's player count with a fixed value.
Risk of Options is required, an entry in the game Settings will appear to configure the player count in-game.
Overrides both participatingPlayerCount and livingPlayerCount.
The later is only overriden when the custom player count value is less than the vanilla value.
This is because the variable is also used for things like HoldOutZone and Mithrix cutscene when the fight start and those can never trigger properly if you put a number greater than the number of player currently in the game.
As a sideffect of this, monster health scaling will never be greater than the amount of player currently alive.
