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/vision/math/BUILD b/aos/vision/math/BUILD
index 0fbdf7a..2c71e8f 100644
--- a/aos/vision/math/BUILD
+++ b/aos/vision/math/BUILD
@@ -12,8 +12,7 @@
         "vector.h",
     ],
     deps = [
-        "//third_party/eigen",
-        "@com_google_ceres_solver//:ceres",
+        "@org_tuxfamily_eigen//:eigen",
     ],
 )