Import all other unit definitions from CLHEP

[ManuelHu]

fixes #175

(the code layout is different, as this actually just the original setSystemOfUnits.cc from CLHEP converted to python by some c preprocessor magic and sed)

[ManuelHu]

We would have to discuss what of those changes to keep, before I would start working on the failed tests :-)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.31%. Comparing base (fab6b07) to head (6cd6037).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #176      +/-   ##
==========================================
+ Coverage   70.00%   70.31%   +0.31%     
==========================================
  Files         152      152              
  Lines       23170    23413     +243     
==========================================
+ Hits        16220    16463     +243     
  Misses       6950     6950              

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[ManuelHu]

@stewartboogert If CI passes, this PR would be ready from my side