Perform basic turret auto-aiming

Implements a basic aimer which will shoot balls straight at the origin.

This still leaves a variety of things to be done:
-Actually shooting at the correct coordinates.
-Choosing between whether to shoot at the 2-point goal or 3-point goal.
-Managing turret wrap/redundancy intelligently.
-Shooting on the fly.

Change-Id: If4fc6249951faa5300411a0ca7d29da9e11dbb15
diff --git a/y2020/control_loops/superstructure/BUILD b/y2020/control_loops/superstructure/BUILD
index d81b6b5..4534404 100644
--- a/y2020/control_loops/superstructure/BUILD
+++ b/y2020/control_loops/superstructure/BUILD
@@ -62,8 +62,11 @@
         ":superstructure_status_fbs",
         "//aos/controls:control_loop",
         "//aos/events:event_loop",
+        "//frc971/control_loops:control_loops_fbs",
+        "//frc971/control_loops/drivetrain:drivetrain_status_fbs",
         "//y2020:constants",
         "//y2020/control_loops/superstructure/shooter",
+        "//y2020/control_loops/superstructure/turret:aiming",
     ],
 )