Move Canvas and QRCode to iced crate

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

examples/arc/src/main.rs

@@ -69,7 +69,7 @@ impl Application for Arc {
     }
 }
 
-impl<Message> canvas::Program<Message, Renderer> for Arc {
+impl<Message> canvas::Program<Message> for Arc {
     type State = ();
 
     fn draw(

examples/bezier_tool/src/main.rs

@@ -92,7 +92,7 @@ mod bezier {
         curves: &'a [Curve],
     }
 
-    impl<'a> canvas::Program<Curve, Renderer> for Bezier<'a> {
+    impl<'a> canvas::Program<Curve> for Bezier<'a> {
         type State = Option<Pending>;
 
         fn update(

examples/color_palette/src/main.rs

@@ -237,7 +237,7 @@ impl Theme {
     }
 }
 
-impl<Message> canvas::Program<Message, Renderer> for Theme {
+impl<Message> canvas::Program<Message> for Theme {
     type State = ();
 
     fn draw(

examples/game_of_life/src/main.rs

@@ -393,7 +393,7 @@ mod grid {
         }
     }
 
-    impl canvas::Program<Message, Renderer> for Grid {
+    impl canvas::Program<Message> for Grid {
         type State = Interaction;
 
         fn update(

examples/sierpinski_triangle/src/main.rs

@@ -97,7 +97,7 @@ struct SierpinskiGraph {
     cache: canvas::Cache,
 }
 
-impl canvas::Program<Message, Renderer> for SierpinskiGraph {
+impl canvas::Program<Message> for SierpinskiGraph {
     type State = ();
 
     fn update(

examples/solar_system/src/main.rs

@@ -150,7 +150,7 @@ impl State {
     }
 }
 
-impl<Message> canvas::Program<Message, Renderer> for State {
+impl<Message> canvas::Program<Message> for State {
     type State = ();
 
     fn draw(