pub struct App{
    updates: Vec<Box<dyn Fn(&mut Runtime)>>,
    starts: Vec<Box<dyn Fn(&mut Runtime)>>,
}
pub struct Runtime {
    pub context: GraphicsContext,
    pub size: winit::dpi::PhysicalSize<u32>,
    pub camera: Camera,
    pub camera_controller: CameraController,
    pub input: CursorInput,
    pub pass: PhongPass,
    pub nodes: Vec<Node>,
}
pub async fn run() {
    App::new()
        .add_system(Stage::Update, render)
        .add_system(Stage::Update, update)
        .run().await;
}