fix fxml
kill drug-2
use encode shift-jis in save
add prologue
fix bug of day, always day in load
implement coin_box
fake implement for_backward_compatibility
add coin_box to save_unit
initialize coin_box in start
consider coin_box in save
consider coin_box in load
implement exploit coin
implement exploit_coint
implement coin_box.add_coin!
implement pay-coin success or fail
implement refresh_back_to_menu_list_to_blank
implement game-over
refine exploit coin
implement exploit coin scenario
show next-goal money