3d jan/extend volumetric examples

[3dJan]

Adding an additional example that generates a complete model.

[3dJan]

It also contains the fix to the classparam template.

[codecov]

Codecov Report

Attention: Patch coverage is 92.30769% with 1 line in your changes missing coverage. Please review.

Project coverage is 66.08%. Comparing base (721f83b) to head (d52535e).
Report is 5 commits behind head on vijai/volumetricExamples.

Files with missing lines	Patch %	Lines
Autogenerated/Bindings/Cpp/lib3mf_implicit.hpp	92.30%	1 Missing ⚠️

Additional details and impacted files

@@                     Coverage Diff                      @@
##           vijai/volumetricExamples     #402      +/-   ##
============================================================
- Coverage                     66.08%   66.08%   -0.01%     
============================================================
  Files                           395      395              
  Lines                         44625    44625              
============================================================
- Hits                          29492    29489       -3     
- Misses                        15133    15136       +3     

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