OutputLists Combinations

Takes up to 4 OutputLists and generates every combination of them. Example: `[1, 2, 3] x ["A", "B"] = [(1, "A"), (1, "B"), (2, "A"), (2, "B"), (3, "A"), (3, "B")]` `unzip_a` .. `unzip_d` use(s) `is_output_list=True` (indicated by the symbol `𝌠`) and will be processed sequentially by corresponding nodes. All lists are optional and empty lists will be ignored. Technically it computes *the Cartesian product* and outputs each combination splitted up into their elements (`unzip`), whereas empty lists will be replaced with units of `None` and they will emit `None` on the respective output. Example: `[1, 2] x [] x ["A", "B"] x [] = [(1, None, "A", None), (1, None, "B", None), (2, None, "A", None), (2, None, "B", None)]`