Add frame element with plastic and softening behaviour

[Sergesto]

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[codecov]

Codecov Report

Attention: Patch coverage is 0.24450% with 408 lines in your changes are missing coverage. Please review.

Project coverage is 76.93%. Comparing base (dcc60c0) to head (df83019).

❗ Current head df83019 differs from pull request most recent head 5779b3c

Please upload reports for the commit 5779b3c to get more accurate results.

Files	Patch %	Lines
...ples/plasticCantileverBeam/plasticCantileverBeam.m	0.00%	129 Missing ⚠️
...rc/elements/frame/frame2D_plastic_internal_force.m	0.00%	63 Missing ⚠️
src/elements/frame/integrand_plastic.m	0.00%	56 Missing ⚠️
src/elements/frame/framePlastic.m	0.00%	53 Missing ⚠️
src/elements/frame/framePlastic_casopartic.m	0.00%	49 Missing ⚠️
...tileverBeam/plasticCantileverBeam_integradoONSAS.m	0.00%	48 Missing ⚠️
src/core/assembler.m	0.00%	10 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #687       +/-   ##
===========================================
- Coverage   88.98%   76.93%   -12.05%     
===========================================
  Files         131      144       +13     
  Lines        4492     4991      +499     
===========================================
- Hits         3997     3840      -157     
- Misses        495     1151      +656     

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