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

Change-Id: I9ed9006ce6224e2df0459df47771786b928164a1
diff --git a/frc971/codelab/basic_goal.fbs b/frc971/codelab/basic_goal.fbs
index cfde3ba..9509fa7 100644
--- a/frc971/codelab/basic_goal.fbs
+++ b/frc971/codelab/basic_goal.fbs
@@ -5,7 +5,7 @@
 table Goal {
   // If set to true, the intake should turn on the motor and run until the
   // limit sensor in the Position message turns on.
-  intake:bool;
+  intake:bool (id: 0);
 }
 
 root_type Goal;