Move Canvas and QRCode to iced crate

Rename `canvas` modules to `geometry` in graphics subcrates

graphics/src/geometry.rs

@@ -0,0 +1,36 @@
+//! Draw 2D graphics for your users.
+//!
+//! A [`Canvas`] widget can be used to draw different kinds of 2D shapes in a
+//! [`Frame`]. It can be used for animation, data visualization, game graphics,
+//! and more!
+pub mod fill;
+pub mod path;
+pub mod stroke;
+
+mod style;
+mod text;
+
+pub use fill::Fill;
+pub use path::Path;
+pub use stroke::{LineCap, LineDash, LineJoin, Stroke};
+pub use style::Style;
+pub use text::Text;
+
+pub use iced_native::gradient::{self, Gradient};
+
+use crate::Primitive;
+
+#[derive(Debug, Clone)]
+pub struct Geometry(pub Primitive);
+
+impl From<Geometry> for Primitive {
+    fn from(geometry: Geometry) -> Self {
+        geometry.0
+    }
+}
+
+pub trait Renderer: iced_native::Renderer {
+    type Geometry;
+
+    fn draw(&mut self, geometry: Vec<Self::Geometry>);
+}