refactor RegistrationPCL

[koide3]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 58.33333% with 15 lines in your changes are missing coverage. Please review.

Project coverage is 91.75%. Comparing base (d09f920) to head (3b96c83).
Report is 1 commits behind head on master.

Files	Patch %	Lines
include/small_gicp/pcl/pcl_registration_impl.hpp	54.54%	15 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #18      +/-   ##
==========================================
- Coverage   92.42%   91.75%   -0.67%     
==========================================
  Files          36       35       -1     
  Lines        1148     1177      +29     
  Branches      175      182       +7     
==========================================
+ Hits         1061     1080      +19     
- Misses         87       97      +10     

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