Function game::setup_app

fn setup_app(
    ctx: &mut EventCtx<'_>, 
    flags: Flags, 
    opts: Options, 
    start_with_edits: Option<String>, 
    maybe_mode: Option<GameplayMode>, 
    initialize_tutorial: bool, 
    center_camera: Option<String>
) -> (App, Vec<Box<dyn State<App>>>)