Feat: add global context functions

Add functions like window() and router() to
allow dynamically grabbing global contexts
without have to use the hook variants.

Deprecates the existing hook variants to
discourage folks from adding more noise
to their codebases.

examples/login_form.rs

@@ -8,27 +8,25 @@ fn main() {
 }
 
 fn app(cx: Scope) -> Element {
-    let onsubmit = move |evt: FormEvent| {
-        cx.spawn(async move {
-            let resp = reqwest::Client::new()
-                .post("http://localhost:8080/login")
-                .form(&[
-                    ("username", &evt.values["username"]),
-                    ("password", &evt.values["password"]),
-                ])
-                .send()
-                .await;
+    let onsubmit = move |evt: FormEvent| async move {
+        let resp = reqwest::Client::new()
+            .post("http://localhost:8080/login")
+            .form(&[
+                ("username", &evt.values["username"]),
+                ("password", &evt.values["password"]),
+            ])
+            .send()
+            .await;
 
-            match resp {
-                // Parse data from here, such as storing a response token
-                Ok(_data) => println!("Login successful!"),
+        match resp {
+            // Parse data from here, such as storing a response token
+            Ok(_data) => println!("Login successful!"),
 
-                //Handle any errors from the fetch here
-                Err(_err) => {
-                    println!("Login failed - you need a login server running on localhost:8080.")
-                }
+            //Handle any errors from the fetch here
+            Err(_err) => {
+                println!("Login failed - you need a login server running on localhost:8080.")
             }
-        });
+        }
     };
 
     cx.render(rsx! {