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Make StrainProductAssembler use lambdas

Gitlab Import requested to merge feature/strain-product-lambda-rework2 into master

Also extend the StVenantKirchhoffAssembler to heterogeneous materials. In the world of viscosity, we previously had two classes for this purpose:

  • ViscosityAssembler
  • VariableCoefficientViscosityAssembler

The former can now also perform the job of the latter.

This is a replacement for !3 (closed). I'm much happier with the way this has turned out. The VariableCoefficientViscosityAssembler is now entirely obsolete. I had to add a set() method, making the strain-to-stress translation something you can change at run-time. Maybe that's actually even desirable. But I did it because I did not want to have the entire class parametrised after the functions that you pass to set().

PS: This also gets rid of CRTP. Yay.

PPS: And ctype is now properly used (instead of double, the default)

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