implement launch builder for the desktop and web platforms

examples/window_focus.rs

@@ -5,9 +5,9 @@ use dioxus_desktop::use_wry_event_handler;
 use dioxus_desktop::{Config, WindowCloseBehaviour};
 
 fn main() {
-    Config::new()
-        .with_close_behaviour(WindowCloseBehaviour::CloseWindow)
-        .launch(app)
+    LaunchBuilder::new(app)
+        .cfg(Config::new().with_close_behaviour(WindowCloseBehaviour::CloseWindow))
+        .launch()
 }
 
 fn app() -> Element {
@@ -22,12 +22,7 @@ fn app() -> Element {
     });
 
     rsx! {
-        div {
-            width: "100%",
-            height: "100%",
-            display: "flex",
-            flex_direction: "column",
-            align_items: "center",
+        div { width: "100%", height: "100%", display: "flex", flex_direction: "column", align_items: "center",
             if focused() {
                 "This window is focused!"
             } else {