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/y2017/vision/vision.fbs b/y2017/vision/vision.fbs
new file mode 100644
index 0000000..f1bc013
--- /dev/null
+++ b/y2017/vision/vision.fbs
@@ -0,0 +1,16 @@
+namespace y2017.vision;
+
+// Published on ".y2017.vision.vision_status"
+table VisionStatus {
+  image_valid:bool;
+
+  // Distance to the target in meters.
+  distance:double;
+  // The angle in radians of the bottom of the target.
+  angle:double;
+
+  // Capture time of the angle using the clock behind monotonic_clock::now().
+  target_time:long;
+}
+
+root_type VisionStatus;