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/blob/BUILD b/aos/vision/blob/BUILD
index 7d5f930..e025ed3 100644
--- a/aos/vision/blob/BUILD
+++ b/aos/vision/blob/BUILD
@@ -11,7 +11,7 @@
         "//aos/vision/image:image_types",
         "//aos/vision/math:segment",
         "//aos/vision/math:vector",
-        "//third_party/eigen",
+        "@org_tuxfamily_eigen//:eigen",
     ],
 )
 
@@ -72,7 +72,7 @@
         ":contour",
         ":disjoint_set",
         ":range_image",
-        "//third_party/eigen",
+        "@org_tuxfamily_eigen//:eigen",
     ],
 )
 
@@ -90,7 +90,7 @@
         ":range_image",
         "//aos/vision/debug:overlay",
         "//aos/vision/math:segment",
-        "//third_party/eigen",
+        "@org_tuxfamily_eigen//:eigen",
     ],
 )
 
@@ -102,7 +102,7 @@
         ":range_image",
         "//aos/vision/debug:overlay",
         "//aos/vision/math:segment",
-        "//third_party/eigen",
+        "@org_tuxfamily_eigen//:eigen",
     ],
 )