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/y2018/vision/vision.fbs b/y2018/vision/vision.fbs
new file mode 100644
index 0000000..14f8a45
--- /dev/null
+++ b/y2018/vision/vision.fbs
@@ -0,0 +1,9 @@
+namespace y2018.vision;
+
+// Published on ".y2018.vision.vision_status"
+table VisionStatus {
+  high_frame_count:uint;
+  low_frame_count:uint;
+}
+
+root_type VisionStatus;