Add ur_calibration package

[fmauch]

Closes #384

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (foxy@69c2030). Click here to learn what that means. Patch has no changes to coverable lines.

Additional details and impacted files

@@          Coverage Diff           @@
##             foxy    #451   +/-   ##
======================================
  Coverage        ?   3.73%           
======================================
  Files           ?      16           
  Lines           ?    1071           
  Branches        ?     212           
======================================
  Hits            ?      40           
  Misses          ?     942           
  Partials        ?      89           

Flag	Coverage Δ
unittests	3.73% <0.00%> (?)

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[fmauch]

I'll merge it like this and then create a separate PR regarding the usage, as we'll need that on all three branches.