Sinadmode

[22Chaos]

This pull-request introduces Sinad mode, a toggle-able setting in the menu that modifies the mission sizes of 6 player Avalon. If mission 1 and 2 both succeed, and mission 3 fails, and if mission 3 was not a superset of m2, (i.e. m3!=m2+1) The mission size for Mission 4 becomes a 4-man team, and the final mission 5 becomes a 3-man team.

The author hopes that this mode will make 6p games more interesting.