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/configuration.fbs b/aos/configuration.fbs
index d23c4b9..a5cb59f 100644
--- a/aos/configuration.fbs
+++ b/aos/configuration.fbs
@@ -1,3 +1,5 @@
+include "reflection/reflection.fbs";
+
 namespace aos;
 
 // Table representing a channel.  Channels are where data is published and
@@ -12,6 +14,9 @@
   // Max size of the data being published.  (This will be automatically
   // computed in the future.)
   max_size:int = 1000;
+
+  // The schema for the data sent on this channel.
+  schema:reflection.Schema;
 }
 
 // Table to support renaming channel names.