Merge branch '28-normalize-activity-application-architecture' into 'master'

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

lib/cubit/settings/settings_global_state.dart

lib/main.dart

lib/models/activity/activity.dart

lib/models/activity/board.dart

lib/models/activity/cell.dart

lib/models/activity/cell_location.dart

lib/models/settings/settings_activity.dart

lib/ui/game/game_end.dart

lib/ui/game/game_top.dart

lib/ui/screens/page_game.dart

lib/ui/skeleton.dart

lib/ui/widgets/actions/button_delete_saved_game.dart

lib/ui/widgets/actions/button_game_quit.dart

lib/ui/widgets/actions/button_game_start_new.dart

lib/ui/widgets/actions/button_resume_saved_game.dart

lib/ui/widgets/game/game_board.dart