Determines a [Plan] to accomplish the todo list from the provided state.
The todo list is an array of goals, [Multigoal], tasks, and actions.
A goal is defined as one predicate-subject-object triple.
A [Multigoal] is a state [Dictionary] of predicate-subject-object triples.
Tasks can accept any number of arguments but only return either false or a series of goals, [Multigoal], tasks, and actions.
Actions can accept any number of arguments but only return the state of predicate-subject-object triples.
The return value is a [Variant], which means it could be of any type. In this case, it returns either false or an array of actions.