start program without spawning thread so screen works on mac. improve mouse demo

launcher/src/main.rs

@@ -148,9 +148,8 @@ fn main() -> anyhow::Result<()> {
     let mut thread = RunThread::new(ThreadToken(0), None, parsed.clone(), Addr(0), args);
     thread.set_speed(config.cycle_time);
 
-    let a = thread.start();
-    // ...
-    let _ = a.join();
+    // run without spawning, so it is on the main thread - required by some extensions
+    thread.run();
 
     info!("Runtime shut down.");