Simplify Iris app initialization and task updates

examples/bench_images/desktop.rs

@@ -3,7 +3,6 @@ use winit::event::WindowEvent;
 
 #[path = "lib.rs"]
 mod app;
-use app::*;
 
 const SETTLE_FRAMES: usize = 4;
 const FRAMES: usize = 6;
@@ -17,8 +16,8 @@ struct State {
 }
 
 impl DesktopAppState for State {
-    fn new(mut ui_state: DesktopUiState, rsc: &mut StdRsc<Self>, _: Proxy<Self::Event>) -> Self {
-        let span = build(rsc, &mut ui_state);
+    fn new(mut ui_state: DesktopUiState, rsc: &mut StdRsc<Self>) -> Self {
+        let span = app::build(rsc, &mut ui_state);
         Self {
             ui_state,
             span,