separate state from rsc

examples/minimal.rs

@@ -1,20 +1,17 @@
 use iris::prelude::*;
 
 fn main() {
-    App::<State>::run();
+    DefaultApp::<State>::run();
 }
 
-#[default_ui_state]
-struct State {}
+#[derive(DefaultUiState)]
+struct State {
+    ui_state: DefaultUiState,
+}
 
 impl DefaultAppState for State {
-    fn new(ui_state: DefaultUiState, _proxy: Proxy<Self::Event>) -> Self {
-        let mut ui = Ui::new();
-        rect(Color::RED).set_root(&mut ui);
-        Self {
-            ui,
-            ui_state,
-            events: EventManager::default(),
-        }
+    fn new(ui_state: DefaultUiState, rsc: &mut DefaultRsc<Self>, _: Proxy<Self::Event>) -> Self {
+        rect(Color::RED).set_root(rsc);
+        Self { ui_state }
     }
 }