new 'Party.DI()' method to return the Party's instance of the new 'APIBuilderDI' and move the DI-relative Router to this new APIBuilderDI

Former-commit-id: 2fb81406c6e3162991c90e0918a3cac1b77c2b54

_examples/desktop-app/webview/main.go

@@ -34,6 +34,11 @@ func runServer() {
 }
 
 func showAndWaitWindow() {
-	webview.Open("My App",
-		addr, 800, 600, true)
+	debug := true
+	w := webview.New(debug)
+	defer w.Destroy()
+	w.SetTitle("Minimal webview example")
+	w.SetSize(800, 600, webview.HintNone)
+	w.Navigate("https://iris-go.com")
+	w.Run()
 }