Rename PotAndAbsEncoder to be more consistent

$ git sed 's/AbsoluteEstimatorState/PotAndAbsoluteEncoderEstimatorState/'
$ git sed 's/PotAndAbsEncoderZeroingEstimator/PotAndAbsoluteEncoderZeroingEstimator/'

It's a bit all over the place in terms of naming and doesn't leave much
space to name something which is just an absolute encoder.

Change-Id: Iecbee91191bd9cc16eb08fd24b91335ef772beec
diff --git a/y2018/control_loops/superstructure/arm/arm.h b/y2018/control_loops/superstructure/arm/arm.h
index a9b3590..0a4666a 100644
--- a/y2018/control_loops/superstructure/arm/arm.h
+++ b/y2018/control_loops/superstructure/arm/arm.h
@@ -91,8 +91,10 @@
   ::aos::monotonic_clock::time_point claw_close_start_time_ =
       ::aos::monotonic_clock::min_time;
 
-  ::frc971::zeroing::PotAndAbsEncoderZeroingEstimator proximal_zeroing_estimator_;
-  ::frc971::zeroing::PotAndAbsEncoderZeroingEstimator distal_zeroing_estimator_;
+  ::frc971::zeroing::PotAndAbsoluteEncoderZeroingEstimator
+      proximal_zeroing_estimator_;
+  ::frc971::zeroing::PotAndAbsoluteEncoderZeroingEstimator
+      distal_zeroing_estimator_;
 
   double proximal_offset_ = 0.0;
   double distal_offset_ = 0.0;