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/y2017/control_loops/superstructure/column/BUILD b/y2017/control_loops/superstructure/column/BUILD
index 2d83482..6e1cc7f 100644
--- a/y2017/control_loops/superstructure/column/BUILD
+++ b/y2017/control_loops/superstructure/column/BUILD
@@ -71,6 +71,8 @@
         "//frc971:constants",
         "//frc971/control_loops:profiled_subsystem_fbs",
         "//frc971/zeroing",
+        "//frc971/zeroing:hall_effect_and_position",
+        "//frc971/zeroing:pulse_index",
         "//frc971/zeroing:wrap",
         "//y2017:constants",
         "//y2017/control_loops/superstructure:superstructure_position_fbs",
diff --git a/y2017/control_loops/superstructure/column/column.cc b/y2017/control_loops/superstructure/column/column.cc
index 9acd190..b8a12f7 100644
--- a/y2017/control_loops/superstructure/column/column.cc
+++ b/y2017/control_loops/superstructure/column/column.cc
@@ -11,6 +11,7 @@
 #include "frc971/constants.h"
 #include "frc971/control_loops/profiled_subsystem.h"
 #include "frc971/control_loops/state_feedback_loop.h"
+#include "frc971/zeroing/pulse_index.h"
 #include "y2017/control_loops/superstructure/column/column_integral_plant.h"
 #include "y2017/control_loops/superstructure/column/stuck_column_integral_plant.h"
 
diff --git a/y2017/control_loops/superstructure/column/column_zeroing.h b/y2017/control_loops/superstructure/column/column_zeroing.h
index a7fe47b..c07a504 100644
--- a/y2017/control_loops/superstructure/column/column_zeroing.h
+++ b/y2017/control_loops/superstructure/column/column_zeroing.h
@@ -2,6 +2,7 @@
 #define Y2017_CONTROL_LOOPS_SUPERSTRUCTURE_COLUMN_H_
 
 #include "frc971/constants.h"
+#include "frc971/zeroing/hall_effect_and_position.h"
 #include "frc971/zeroing/zeroing.h"
 #include "y2017/constants.h"
 #include "y2017/control_loops/superstructure/superstructure_position_generated.h"