Related #3412.

[Data Explorer] Include Layers2Grid

See merge request ogs/ogs!4622

MFront internal state variable initialization from project file

See merge request ogs/ogs!4636

The material properties were created to for initialization which is now
possible directly from OGS' project file. The two material properties
are removed and the python script are updated.

The previously reused pc0 material property is renamed to characteristic
pre-consolidation pressure.

First implementation for MFront only.

The internal state variables initial value parameters
are stored in the map for later initialization by the
local assembler.

Some can be const, but one string is actually being moved, so no const
explicitly.

E.g. for having the markdownlint check.

[tools] Extract functions from Vtu2Grid

See merge request ogs/ogs!4601

Always output OGS_VERSION into vtu and xdmf files

See merge request ogs/ogs!4638

-now in header

- getDimensions() now called getNumberOfVoxelPerDimension()
- now input is ranges instead of min max
- and included restrictions to function (only positive cellsize)
- if ranges = 0 return 1 voxel per dimension
- removed constexpr of str cell_id_name
- clang-format

- now pnt is directly assigned without assigning i,j,k
and write them to a pnt

- tidied up includes
- moved cell_id_name to namespace
- docu cell_id_name
- secured to dereference property with "cell_id_name"

meshgenerators moved to meshtoolslib

-from MeshLib::PropertyVector<int> const& to auto

Allowing to make the functions from Vtu2Grid visible
for accessing them in the DataExplorer.

- Make constant_output_names a local std::array
- Initialize the array with initializer list instead of insert in previous version

Correct setting Node properties in linear mesh based on Node properties of quadratic mesh

See merge request ogs/ogs!4635

[XDMF] Correct variable output for empty variables list

See merge request ogs/ogs!4632

[web] Update docs guidelines

See merge request ogs/ogs!4634