Clean / improve / update code

lib/config/default_game_settings.dart

lib/config/default_global_settings.dart

lib/config/menu.dart

lib/config/theme.dart

lib/coordinate.dart

lib/cpu.dart

lib/cpu_level_page.dart

lib/cubit/game_cubit.dart

lib/cubit/game_state.dart

lib/cubit/nav_cubit.dart

lib/cubit/settings_game_cubit.dart

lib/cubit/settings_game_state.dart

lib/cubit/settings_global_cubit.dart

lib/cubit/settings_global_state.dart

lib/cubit/theme_cubit.dart

lib/cubit/theme_state.dart

lib/game_chip.dart

lib/hole_painter.dart

lib/home_page.dart

lib/main.dart