Move Canvas and QRCode to iced crate

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

native/src/widget/canvas/style.rs

@@ -1,24 +0,0 @@
-use crate::widget::canvas::Gradient;
-use crate::Color;
-
-/// The coloring style of some drawing.
-#[derive(Debug, Clone, PartialEq)]
-pub enum Style {
-    /// A solid [`Color`].
-    Solid(Color),
-
-    /// A [`Gradient`] color.
-    Gradient(Gradient),
-}
-
-impl From<Color> for Style {
-    fn from(color: Color) -> Self {
-        Self::Solid(color)
-    }
-}
-
-impl From<Gradient> for Style {
-    fn from(gradient: Gradient) -> Self {
-        Self::Gradient(gradient)
-    }
-}