Add control panel messages to superstructure

Change-Id: Iecf05ef8f872928364104f2df17af6e24e275a0d
diff --git a/y2020/control_loops/superstructure/superstructure_position.fbs b/y2020/control_loops/superstructure/superstructure_position.fbs
index ed73e52..25be42d 100644
--- a/y2020/control_loops/superstructure/superstructure_position.fbs
+++ b/y2020/control_loops/superstructure/superstructure_position.fbs
@@ -24,6 +24,9 @@
 
   // Position of the kicker and flywheel
   shooter:ShooterPosition;
+
+   // Position of the control panel, relative to start, positive counterclockwise from above.
+  control_panel:frc971.RelativePosition;
 }
 
 root_type Position;