Add control panel messages to superstructure

Change-Id: Iecf05ef8f872928364104f2df17af6e24e275a0d
diff --git a/y2020/control_loops/superstructure/superstructure_output.fbs b/y2020/control_loops/superstructure/superstructure_output.fbs
index 9048b33..61b4e0a 100644
--- a/y2020/control_loops/superstructure/superstructure_output.fbs
+++ b/y2020/control_loops/superstructure/superstructure_output.fbs
@@ -28,6 +28,9 @@
 
   // Voltage sent to the flywheel. Positive is shooting.
   flywheel_voltage:double;
+
+  // Voltage sent to the motor driving the control panel. Positive is counterclockwise from above.
+  control_panel_voltage:double;
 }
 
 root_type Output;