allow to stop and start http server at will with SIGINT, stop the server on uncaught throws, display timing info for each request, use setup_call_cleanup in more places to avoid potential leaks, when handler for a path doesn't have a matching case, throw a detailed error instead of silently continuing

build/instructions_template.rs

@@ -599,6 +599,8 @@ enum SystemClauseType {
     HttpOpen,
     #[strum_discriminants(strum(props(Arity = "5", Name = "$http_listen")))]
     HttpListen,
+    #[strum_discriminants(strum(props(Arity = "1", Name = "$http_listen_stop")))]
+    HttpListenStop,
     #[strum_discriminants(strum(props(Arity = "7", Name = "$http_accept")))]
     HttpAccept,
     #[strum_discriminants(strum(props(Arity = "4", Name = "$http_answer")))]