remove state generic from a lot of things

src/default/input.rs

@@ -66,7 +66,7 @@ impl Input {
     }
 }
 
-impl<State> UiState<State> {
+impl UiState {
     pub fn window_size(&self) -> Vec2 {
         let size = self.renderer.window().inner_size();
         (size.width, size.height).into()