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.cc b/aos/ipc_lib/queue_racer.cc
index 53490a0..bb754d8 100644
--- a/aos/ipc_lib/queue_racer.cc
+++ b/aos/ipc_lib/queue_racer.cc
@@ -82,12 +82,15 @@
       //
       // So, grab them in order.
       const uint64_t finished_writes = finished_writes_.load();
-      const uint32_t latest_queue_index_uint32_t = queue.LatestQueueIndex();
+      const QueueIndex latest_queue_index_queue_index =
+          queue.LatestQueueIndex();
       const uint64_t started_writes = started_writes_.load();
 
+      const uint32_t latest_queue_index_uint32_t =
+          queue.LatestQueueIndex().index();
       uint64_t latest_queue_index = latest_queue_index_uint32_t;
 
-      if (latest_queue_index_uint32_t != LocklessQueue::empty_queue_index()) {
+      if (latest_queue_index_queue_index != LocklessQueue::empty_queue_index()) {
         // If we got smaller, we wrapped.
         if (latest_queue_index_uint32_t < last_queue_index) {
           ++wrap_count;
@@ -104,19 +107,19 @@
 
       // If we are at the beginning, the queue needs to always return empty.
       if (started_writes == 0) {
-        EXPECT_EQ(latest_queue_index_uint32_t,
+        EXPECT_EQ(latest_queue_index_queue_index,
                   LocklessQueue::empty_queue_index());
         EXPECT_EQ(finished_writes, 0);
       } else {
         if (finished_writes == 0) {
           // Plausible to be at the beginning.
-          if (latest_queue_index_uint32_t !=
+          if (latest_queue_index_queue_index !=
               LocklessQueue::empty_queue_index()) {
             // Otherwise, we have started.  The queue is always allowed to
             EXPECT_GE(started_writes, latest_queue_index + 1);
           }
         } else {
-          EXPECT_NE(latest_queue_index_uint32_t,
+          EXPECT_NE(latest_queue_index_queue_index,
                     LocklessQueue::empty_queue_index());
           // latest_queue_index is an index, not a count.  So it always reads 1
           // low.