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/motors/BUILD b/motors/BUILD
index d7dc456..8fe5ff6 100644
--- a/motors/BUILD
+++ b/motors/BUILD
@@ -131,6 +131,7 @@
     srcs = [
         "simple_receiver.cc",
     ],
+    copts = ["-Wno-type-limits"],
     restricted_to = mcu_cpus,
     deps = [
         ":util",
@@ -153,6 +154,7 @@
     srcs = [
         "simpler_receiver.cc",
     ],
+    copts = ["-Wno-type-limits"],
     restricted_to = mcu_cpus,
     deps = [
         ":util",