texture freeing + render updates done a bit nicer

src/testing/render/mod.rs

@@ -1,7 +1,7 @@
 use pollster::FutureExt;
 use std::sync::Arc;
 use ui::{
-    UiRenderUpdates,
+    Ui,
     render::{UiLimits, UiRenderer},
 };
 use wgpu::{util::StagingBelt, *};
@@ -21,7 +21,7 @@ pub struct Renderer {
 }
 
 impl Renderer {
-    pub fn update(&mut self, updates: UiRenderUpdates) {
+    pub fn update<Ctx>(&mut self, updates: &mut Ui<Ctx>) {
         self.ui.update(&self.device, &self.queue, updates);
     }