Convert aos over to flatbuffers

Everything builds, and all the tests pass.  I suspect that some entries
are missing from the config files, but those will be found pretty
quickly on startup.

There is no logging or live introspection of queue messages.

Change-Id: I496ee01ed68f202c7851bed7e8786cee30df29f5
diff --git a/aos/ipc_lib/queue_racer.h b/aos/ipc_lib/queue_racer.h
index 59435b1..eaeedd4 100644
--- a/aos/ipc_lib/queue_racer.h
+++ b/aos/ipc_lib/queue_racer.h
@@ -36,7 +36,7 @@
 
   size_t CurrentIndex() {
     LocklessQueue queue(memory_, config_);
-    return queue.LatestQueueIndex();
+    return queue.LatestQueueIndex().index();
   }
 
  private: