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/frc971/wpilib/pdp_values.fbs b/frc971/wpilib/pdp_values.fbs
new file mode 100644
index 0000000..4db2ade
--- /dev/null
+++ b/frc971/wpilib/pdp_values.fbs
@@ -0,0 +1,13 @@
+namespace frc971;
+
+// Values retrieved from the PDP.
+// Published on ".frc971.pdp_values"
+table PDPValues {
+  voltage:double;
+  temperature:double;
+  power:double;
+  // Array of 16 currents.
+  currents:[double];
+}
+
+root_type PDPValues;