Cleaning up lpxclient and lpxserver in preparation for redirect implementation

luprex/cpp/core/lpxclient.cpp

@@ -222,7 +222,9 @@ public:
                 // If there's nothing new in the printbuffer, this is very fast.
                 world_to_asynchronous();
                 if (print_channeler_.channel(world_->get_printbuffer(actor_id_), retpk)) {
-                    send_invocation(print_channeler_.invocation(actor_id_));
+                    // TODO: Don't necessarily need to do this on every line of output.
+                    // Can send this every 30 seconds or so.
+                    delayed_invocations_.emplace_back(print_channeler_.invocation(actor_id_));
                 }
                 set_have_prints(false);
                 break;