message: Refactor exports in `graphics::layer`
diff: //! Organize rendering primitives into a flattened list of layers.
  mod image;
  -pub mod mesh;
  mod quad;
  mod text;
  +pub mod mesh;
  +
  +pub use image::Image;
  +pub use mesh::Mesh;
  +pub use quad::Quad;
  +pub use text::Text;
  +
  use crate::alignment;
  -pub use crate::layer::image::Image;
  -pub use crate::layer::mesh::Mesh;
  -pub use crate::layer::quad::Quad;
  -pub use crate::layer::text::Text;
  use crate::{
  Background, Font, Point, Primitive, Rectangle, Size, Vector, Viewport,
  };
  