Fix the router and stub out a number of crates to get compiling

examples/calculator.rs

@@ -18,8 +18,8 @@ fn main() {
     dioxus_desktop::launch_cfg(app, config);
 }
 
-fn app(cx: Scope) -> Element {
-    let val = use_state(cx, || String::from("0"));
+fn app() -> Element {
+    let val = use_state(|| String::from("0"));
 
     let input_digit = move |num: u8| {
         if val.get() == "0" {