[codespell] Fix common spelling mistakes pointed out by codespell 2.2.4

See merge request !3427

Cleanup/resolve istlsolver depracations

See merge request !3418

Fix CMakeLists for test use Gmsh instead of gmsh

See merge request !3424

Update installexternal.py latest dune, opm and Mmesh

See merge request !3423

Use std::format instead of fmt, if availalbe

See merge request !3420

GCC 13's std::format seems to be less powerfull compared
to {fmt}
* The width cannot be passed as a variable (like in {2})
* The box character "─" cannot be used as a fill char,
  other chars like "*" are working though.

Formatting ranges is not a part of C++20's std::format,
it is proposed in P2286 and might become part of C++23.
As it is only a single occurence, the explicit version
of printing a FieldVector should be sufficient.

[disc][projection] add missing dune functions include

See merge request !3417

Doxygen/remove shell script

See merge request !3416

[ci] add job for doxygen docu build

Closes #1187

See merge request !3367

Fix CI python tests with dune 2.9

See merge request !3403

[ci] temporary fix for conflicts with opm cmake setup

See merge request !3415

Fix/istl solvers can communicate

Closes #1229

See merge request !3413