Geo/show element isactive in vtk

[mcgicjn2]

📝 Description This is a small core change to output if an element is active in VTK files.

This was originally in our branch but moved and separated to a new branch to allow PR at the core level.

It is a nice feature to have, but is non-critical.

Change originally made by @Vahid-Galavi (Is this what you intended with this changed ?)

🆕 Changelog Please summarize the changes in one list to generate the changelog:

• Added "Active" to allow visualization of active elements in VTK