⚠️ Rename Rounding to CornerRadius (#5673)

Breaking change!

* `Rounding` -> `CornerRadius`
* `rounding` -> `corner_radius`

This is to:
* Clarify
* Conform to other systems (e.g. Figma)
* Avoid confusion with `GuiRounding`

examples/custom_window_frame/src/main.rs

@@ -47,7 +47,7 @@ fn custom_window_frame(ctx: &egui::Context, title: &str, add_contents: impl FnOn
 
     let panel_frame = egui::Frame::new()
         .fill(ctx.style().visuals.window_fill())
-        .rounding(10)
+        .corner_radius(10)
         .stroke(ctx.style().visuals.widgets.noninteractive.fg_stroke)
         .outer_margin(1); // so the stroke is within the bounds
 

examples/images/src/main.rs

@@ -35,7 +35,7 @@ impl eframe::App for MyApp {
                     .on_hover_text_at_pointer("Svg");
 
                 let url = "https://picsum.photos/seed/1.759706314/1024";
-                ui.add(egui::Image::new(url).rounding(10.0))
+                ui.add(egui::Image::new(url).corner_radius(10))
                     .on_hover_text_at_pointer(url);
             });
         });