Remove OpenSG conversion functionality

Fix compiler warnings

Remove setting include dirs in some CMake files

Disallow 32-bit Windows builds.

Target ctest-large now runs all tests.

Copied physical constants from OGS5

Can be forced by setting OGS_32_BIT=ON

maybe cmake now finds out the linker language.

copied from OGS5

Split Gmsh Interface into GeoLib-part and MeshLib-part

TES process

* less privacy
* multiple process variables

Remove iostream include