Turret Messages

Add Turret flat buffer messages to the main superstructure tables.

Change-Id: I4390f59e3db9623af0cec1f330943595883b60f3
diff --git a/y2020/control_loops/superstructure/superstructure_position.fbs b/y2020/control_loops/superstructure/superstructure_position.fbs
index 62754df..aabcd43 100644
--- a/y2020/control_loops/superstructure/superstructure_position.fbs
+++ b/y2020/control_loops/superstructure/superstructure_position.fbs
@@ -8,6 +8,9 @@
 
   // Position of the intake. 0 when four-bar is vertical, positive extended.
   intake_joint:frc971.AbsolutePosition;
+
+  // See goal for definition of 0
+  turret:frc971.PotAndAbsolutePosition;
 }
 
 root_type Position;