Catch panics in child threads (#635)

src/main.rs

@@ -1,5 +1,13 @@
 use av1an_cli::run;
+use std::panic;
+use std::process;
 
 fn main() -> anyhow::Result<()> {
+  let orig_hook = panic::take_hook();
+  // Catch panics in child threads
+  panic::set_hook(Box::new(move |panic_info| {
+    orig_hook(panic_info);
+    process::exit(1);
+  }));
   run()
 }