Added flatbuffer messages for intake and 4-bar.

Change-Id: I2b9523a46d973cca41b578e525d449c1d348c0b0
diff --git a/y2020/control_loops/superstructure/superstructure_position.fbs b/y2020/control_loops/superstructure/superstructure_position.fbs
index 50b9c36..62754df 100644
--- a/y2020/control_loops/superstructure/superstructure_position.fbs
+++ b/y2020/control_loops/superstructure/superstructure_position.fbs
@@ -3,9 +3,11 @@
 namespace y2020.control_loops.superstructure;
 
 table Position {
-
   // Zero is at the horizontal, positive towards the front (meters on the lead screw).
   hood:frc971.AbsolutePosition;
+
+  // Position of the intake. 0 when four-bar is vertical, positive extended.
+  intake_joint:frc971.AbsolutePosition;
 }
 
 root_type Position;