Normalize Activity application architecture

fastlane/metadata/android/en-US/changelogs/16.txt

fastlane/metadata/android/fr-FR/changelogs/16.txt

lib/common/config/activity_page.dart

lib/common/config/screen.dart

lib/common/cubit/nav/nav_cubit_pages.dart

lib/common/cubit/nav/nav_cubit_screens.dart

lib/common/ui/nav/bottom_nav_bar.dart

lib/common/ui/nav/global_app_bar.dart

lib/common/ui/pages/editor.dart

lib/common/ui/pages/home.dart

lib/common/ui/pages/player.dart

lib/common/ui/screens/about.dart

lib/common/ui/screens/activity.dart

lib/common/ui/screens/settings.dart

lib/config/application_config.dart

lib/cubit/activity/activity_cubit.dart

lib/cubit/activity/activity_state.dart

lib/cubit/settings/settings_activity_cubit.dart

lib/cubit/settings/settings_activity_state.dart

lib/cubit/settings/settings_global_cubit.dart