CLI argument to start the server at startup

src/window/gdb.rs

@@ -21,6 +21,12 @@ impl GdbServerWindow {
             server: GdbServer::new(sim_id, client),
         }
     }
+
+    pub fn start(&mut self, port: u16) {
+        self.server.stop();
+        self.port_str = port.to_string();
+        self.server.start(port);
+    }
 }
 
 impl AppWindow for GdbServerWindow {