GitLab

- import STL solid names

Workaround for non-working fltk-config

See merge request !252

fltk-config is a bash script and on windows, if there's no bash environment
FLTK_VERSION will be empty and result in a CMake error. This fixes it
by quoting the version

- remove intrusive alglib stuff in MeshOptimizer, HighOrderMeshOptimizer and MeshQualityOptimizer to enable easy swap of algo

- enable system BGFS and MathEx
- use libmedC instead of libmed
- change system mmg3d and ANN lib names