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/hood/hood.h b/y2017/control_loops/superstructure/hood/hood.h
index 8284e6e..47ace6e 100644
--- a/y2017/control_loops/superstructure/hood/hood.h
+++ b/y2017/control_loops/superstructure/hood/hood.h
@@ -2,6 +2,7 @@
 #define Y2017_CONTROL_LOOPS_SUPERSTRUCTURE_HOOD_HOOD_H_
 
 #include "frc971/control_loops/profiled_subsystem.h"
+#include "frc971/zeroing/pulse_index.h"
 #include "y2017/constants.h"
 #include "y2017/control_loops/superstructure/superstructure_goal_generated.h"