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WIP: Extend `ProximalNewtonSolver` to more general `ProximalSolver`

Patrick Jaaprequested to merge
patrick.jaap_at_tu-dresden.de/dune-solvers:proximal-gradient-solver into master

With this change we can use the structure of the Proximal Newton solver for problem with less differential order of the smooth part.

Things that need some further input:

  • I want to provide shortcuts to ProximalNewtonSolver and ProximalGradientSolver with aliases using using.
  • However, this is a C++20 feature if I want to omit the explicit template arguments
  • The Methods setHessian etc. are only meaningful for diffOrder > 1. Is there a smooth SFINAE method to provide these methods only in this case?

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