Normalize game architecture

assets/ui/placeholder.png

assets/ui/tip_hidden.png

fastlane/metadata/android/en-US/changelogs/62.txt

fastlane/metadata/android/fr-FR/changelogs/62.txt

icons/difficulty_3x3.svg

icons/difficulty_4x4.svg

icons/difficulty_5x5.svg

lib/config/default_game_settings.dart

lib/config/default_global_settings.dart

lib/config/menu.dart

lib/config/theme.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