Support operator*/-> in new flatbuffers API

This was suggested during the initial reviews, and does seem to reduce a
fair amount of overhead.

Change-Id: Icb22106612c3a8430afa0b9dbe0a85f835e5b821
Signed-off-by: James Kuszmaul <james.kuszmaul@bluerivertech.com>
diff --git a/aos/events/pong_lib.cc b/aos/events/pong_lib.cc
index 7fb07c2..8fc3f62 100644
--- a/aos/events/pong_lib.cc
+++ b/aos/events/pong_lib.cc
@@ -42,9 +42,8 @@
   last_send_time_ = ping.send_time();
   aos::Sender<examples::PongStatic>::StaticBuilder builder =
       sender_.MakeStaticBuilder();
-  examples::PongStatic *pong = builder.get();
-  pong->set_value(ping.value());
-  pong->set_initial_send_time(ping.send_time());
+  builder->set_value(ping.value());
+  builder->set_initial_send_time(ping.send_time());
   builder.CheckOk(builder.Send());
 }