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/y2019/jevois/BUILD b/y2019/jevois/BUILD
index 599bcba..0363ced 100644
--- a/y2019/jevois/BUILD
+++ b/y2019/jevois/BUILD
@@ -66,7 +66,7 @@
     deps = [
         "//aos/containers:sized_array",
         "//aos/time",
-        "//third_party/eigen",
+        "@org_tuxfamily_eigen//:eigen",
     ],
 )
 
@@ -79,7 +79,7 @@
     deps = [
         "//aos/containers:sized_array",
         "//aos/time:time_mcu",
-        "//third_party/eigen",
+        "@org_tuxfamily_eigen//:eigen",
     ],
 )