Compiler error caused by (outdated?) Eigen-lib

[anaegel]

Issue: The plugin does not compile with recent C++ compilers:

In file included from /Users/runner/work/ProMesh/ProMesh/ug4-git/plugins/ProMesh/tools/remeshing_tools.cpp:35:
In file included from /Users/runner/work/ProMesh/ProMesh/ug4-git/ugcore/cmake/../../externals/BoostForUG4/../EigenForUG4/Eigen/Dense:1:
In file included from /Users/runner/work/ProMesh/ProMesh/ug4-git/ugcore/cmake/../../externals/BoostForUG4/../EigenForUG4/Eigen/Core:467:
/XXX/ProMesh/ug4-git/ugcore/cmake/../../externals/BoostForUG4/../EigenForUG4/Eigen/src/Core/Transpositions.h:387:87: error: no member named 'derived' in 'Transpose<TranspositionsBase>'
2025-09-15T09:05:19.6549880Z 387 | return Product<OtherDerived, Transpose, AliasFreeProduct>(matrix.derived(), trt.derived());
2025-09-15T09:05:19.6650520Z |

[anaegel]

Hotfix: Change to g++ and downgrade error to warning (e.g. using compile flag -fpermissive)

Related: introlab/rtabmap#1482

Longterm fix: Consider replacing (outdated) eigen lib.