Added SetMaterialsCryEngineName.

An automatic change for Materials based on CryExportNodes. It is the first iteration, UI and minor functionality (set physics) not finished.
"Increase initial counter for that group" I see it here: `counter += 1`.
Instead of writing: "when a material with the group name is present." you should create well named method that performs the logic: `if group.name.replace("CryExportNode_", "") + "__" in material.name:`