Improve game architecture/conception

android/app/build.gradle

android/gradle.properties

assets/files/categories-fr.json

assets/icons/button_back.png

assets/icons/button_start.png

assets/icons/placeholder.png

fastlane/metadata/android/en-US/changelogs/37.txt

fastlane/metadata/android/fr-FR/changelogs/37.txt

icons/build_game_icons.sh

icons/button_back.svg

icons/button_start.svg

icons/placeholder.svg

lib/config/default_game_settings.dart

lib/config/default_global_settings.dart

lib/config/default_settings.dart

lib/config/menu.dart

lib/cubit/game_cubit.dart

lib/cubit/game_state.dart

lib/cubit/nav_cubit.dart

lib/cubit/settings_cubit.dart