Add ids to flatbuffer fields in y2012, y2016, frc971, and aos

Change-Id: I9ed9006ce6224e2df0459df47771786b928164a1
diff --git a/y2016/queues/ball_detector.fbs b/y2016/queues/ball_detector.fbs
index c4ef07c..1ebe28c 100644
--- a/y2016/queues/ball_detector.fbs
+++ b/y2016/queues/ball_detector.fbs
@@ -9,7 +9,7 @@
   // TODO(comran): Check to see if our sensor's output corresponds with the
   // comment above.
 
-  voltage:double;
+  voltage:double (id: 0);
 }
 
 root_type BallDetector;