Remove visibility boilerplate code

[christophfroehlich]

ros-controls/ros2_controllers#1053

[saikishor]

Lgtm

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.75%. Comparing base (240d29c) to head (791d063).

Additional details and impacted files

@@             Coverage Diff              @@
##           ros2-master     #258   +/-   ##
============================================
  Coverage        72.75%   72.75%           
============================================
  Files               25       25           
  Lines             1101     1101           
  Branches            89       89           
============================================
  Hits               801      801           
  Misses             252      252           
  Partials            48       48           

Flag	Coverage Δ
unittests	72.75% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
include/control_toolbox/pid.hpp	77.77% <ø> (ø)
include/control_toolbox/pid_ros.hpp	100.00% <ø> (ø)