Split up zeroing library BUILD rules

There was no good reason for one build rule to have both the interface
and a bunch of implementations; split it up and make the relevant users
depend on the libraries directly.

Change-Id: If6a0aa49dd7ea588b7325604658bc0594db4aac0
Signed-off-by: James Kuszmaul <jabukuszmaul+collab@gmail.com>
diff --git a/y2019/control_loops/superstructure/BUILD b/y2019/control_loops/superstructure/BUILD
index 9504c9f..f97c6f0 100644
--- a/y2019/control_loops/superstructure/BUILD
+++ b/y2019/control_loops/superstructure/BUILD
@@ -69,6 +69,8 @@
         "//aos/events:event_loop",
         "//frc971/control_loops:control_loop",
         "//frc971/control_loops/drivetrain:drivetrain_status_fbs",
+        "//frc971/zeroing:absolute_encoder",
+        "//frc971/zeroing:pot_and_absolute_encoder",
         "//y2019:constants",
         "//y2019:status_light_fbs",
     ],
diff --git a/y2019/control_loops/superstructure/superstructure.h b/y2019/control_loops/superstructure/superstructure.h
index f8ad0fd..4d59132 100644
--- a/y2019/control_loops/superstructure/superstructure.h
+++ b/y2019/control_loops/superstructure/superstructure.h
@@ -5,6 +5,8 @@
 #include "frc971/control_loops/control_loop.h"
 #include "frc971/control_loops/drivetrain/drivetrain_status_generated.h"
 #include "frc971/control_loops/static_zeroing_single_dof_profiled_subsystem.h"
+#include "frc971/zeroing/absolute_encoder.h"
+#include "frc971/zeroing/pot_and_absolute_encoder.h"
 #include "y2019/constants.h"
 #include "y2019/control_loops/superstructure/collision_avoidance.h"
 #include "y2019/control_loops/superstructure/superstructure_goal_generated.h"