fix panic handling (probably) and tweek font discovery

src/renderer/caching_shaper.rs

@@ -39,8 +39,8 @@ fn build_collection_by_font_name(font_name: Option<&str>) -> FontCollection {
     let mut collection = FontCollection::new();
 
     if let Some(font_name) = font_name {
-        if let Ok(custom) = source.select_family_by_name(font_name) {
-            let font = custom.fonts()[0].load().unwrap();
+        if let Ok(custom) = source.select_best_match(&[FamilyName::Title(font_name.to_string())], &Properties::new()) {
+            let font = custom.load().unwrap();
             collection.add_family(FontFamily::new_from_font(font));
         }
     }

src/window.rs

@@ -171,14 +171,12 @@ pub fn ui_loop() {
                 let frame_start = Instant::now();
 
                 if REDRAW_SCHEDULER.should_draw() {
-                    if let Err(err) = panic::catch_unwind(|| {
-                        skulpin_renderer.draw(&window, |canvas, coordinate_system_helper| {
+                    if let Err(e)  = skulpin_renderer.draw(&window, |canvas, coordinate_system_helper| {
                         if renderer.draw(canvas, coordinate_system_helper) {
                             handle_new_grid_size(window.inner_size(), &renderer)
                         }
-                        }).ok();
                     }) {
-                        println!("Render failed. Closing app");
+                        println!("Render failed. Closing");
                         *control_flow = ControlFlow::Exit;
                         return;
                     }