added underdeveloped but working image support (no freeing or samplers)

src/layout/widget.rs

@@ -41,8 +41,7 @@ pub(crate) use WidgetFnRet;
 impl<W: Widget<Ctx>, Ctx, F: FnOnce(&mut Ui<Ctx>) -> W> WidgetLike<Ctx, FnTag> for F {
     type Widget = W;
     fn add(self, ui: &mut Ui<Ctx>) -> WidgetId<W> {
-        let w = self(ui);
-        ui.add(w)
+        self(ui).add(ui)
     }
 }