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Substantial effort towards implementation of *lite* variant.
Some key things to note:
* Decision on convention for naming of scene files (`.scene.toml`).
* Recreation of previous cartoon fight example to pin down casting priorities.
* Decoupling of Story (organisation) from Director (presentation).
* Some refinement around previous patterns used for World and Map.
* Lots more unit tests. Commitment to TDD. They run fast, too.