Show the superstructure sensor positions

Make a table of them.

Change-Id: I9481b6ab3f8ecd14763656c8083d5ab3f3e1c571
diff --git a/y2019/vision/server/server_data.proto b/y2019/vision/server/server_data.proto
index d3e5665..96a5859 100644
--- a/y2019/vision/server/server_data.proto
+++ b/y2019/vision/server/server_data.proto
@@ -40,9 +40,19 @@
   repeated Pose targets = 3;
 }
 
+// Data for the current sensor values.
+message Sensors {
+  // Superstructure calibrated positions.
+  optional float wrist = 1;
+  optional float elevator = 2;
+  optional float intake = 3;
+  optional float stilts = 4;
+}
+
 // The overall package of data that we send to the webpage.
 message DebugData {
   optional Pose robot_pose = 1;
   optional LineFollowDebug line_follow_debug = 2;
   repeated CameraDebug camera_debug = 3;
+  optional Sensors sensors = 4;
 }