Remove deprecated code

[christophfroehlich]

Deprecations are released on Jazzy and Rolling with their sync within the last days.

Fixes #203

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.26%. Comparing base (2fbe2ea) to head (ae6f46f).
Report is 43 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #262      +/-   ##
==========================================
+ Coverage   70.72%   71.26%   +0.54%     
==========================================
  Files           9        9              
  Lines         526      522       -4     
  Branches       87       87              
==========================================
  Hits          372      372              
+ Misses         99       95       -4     
  Partials       55       55              

Flag	Coverage Δ
unittests	71.26% <ø> (+0.54%)	⬆️

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

Files with missing lines	Coverage Δ
include/realtime_tools/realtime_box.hpp	85.24% <ø> (ø)
src/realtime_helpers.cpp	38.61% <ø> (+1.47%)	⬆️

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[saikishor]

I'm not sure if we should do this for Jazzy. This might break users code

[christophfroehlich]

In principle, I agree :D let @bmagyar decide; I could handle the branching for jazzy.