wip: memoize dom in the prescence of identical components

packages/router/src/platform/mod.rs

@@ -0,0 +1,11 @@
+use url::Url;
+
+pub trait RouterProvider {
+    fn get_current_route(&self) -> String;
+    fn subscribe_to_route_changes(&self, callback: Box<dyn Fn(String)>);
+}
+
+enum RouteChange {
+    LinkTo(String),
+    Back(String),
+}