3.8.0 Update

*Realistic character personality *Implement undercover activities such as human-machine separation and poaching *Add 8 new player scripts and update one player script *Add events such as resigning from office, claiming credit, reporting illness, and seeking refuge *When the number of cities exceeds 100, the human-machine strategy skips the flashing animation of the city *Fix the bug of population NaN in cities with zero public support *Fixed the bug where the birth of twins would duplicate an additional military force *Fix the bug that manual conscription does not consume population *Add a "marriage ban" function to prohibit human-machine marriage gifts *Adjust the difficulty settings for "difficulty" and "nightmare" *Guaranteed population growth of 500 per round *Select 'Air Freight' by default