Combined Hardening Plasticity

[@nambirajantamilselvan6152]

Thank you Jorgen for adding this module to mcalibration. The combined hardening model is also highly suitable for metals, especially mild steels.

[@heorgygomez4676]

Muy bueno

[@brunovilloria8145]

Thank you for your video:
What is the origin of the back stress evolution relation @ 4:00? Is it derived from Chaboche model?