add_files(
    timer_game_common.cpp
    timer_game_common.h
    timer_game_calendar.cpp
    timer_game_calendar.h
    timer_game_economy.cpp
    timer_game_economy.h
    timer_game_realtime.cpp
    timer_game_realtime.h
    timer_game_tick.cpp
    timer_game_tick.h
    timer_window.cpp
    timer_window.h
    timer_manager.h
    timer.h
)