Changing 'external' library mode

[tank666]

I previously described the logic in this thread:

@tank666

1. Get a LibraryVariableCollection;
2. Get a LibraryVariable;
3. Import this LibraryVariable by key;
4. Get a variableCollectionId in imported Variable;
5. Get a VariableCollection by id.

After completing the fifth step, you will have a VariableCollection object, which you must use in the setExplicitVariableModeForCollection method.