Specify deifferent minification and magnification filters (#2224)

* Specify deifferent minification and magnification filters

* Fixes

* Update changelogs

* Doctest fixes

* Add deprecation notice for RetainedImage::with_texture_filter

examples/screenshot/src/main.rs

@@ -30,7 +30,7 @@ impl eframe::App for MyApp {
                 self.texture = Some(ui.ctx().load_texture(
                     "screenshot",
                     screenshot,
-                    egui::TextureFilter::Linear,
+                    Default::default(),
                 ));
             }