Implement Tresca Dissipation

Jaap, Patrickrequested to merge
jaap/dune-plasticity:feature/tresca-flow into master

This includes

  • TrescaDissipationDensity with a helper class TrescaHelper
  • An explicit local solver implementation
  • A lot of unit testing
  • A "switch" in the main for changing the DissipationDensity at compile time
Edited by Jaap, Patrick

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