* The Messenger: Don't generate Figurines
* The Messenger: add prerequisite shop cost requirements
* The Messenger: don't double the cost anymore
* The Messenger: remove centered mind prereq instead of checking for it
* The Messenger: use cost as a property to cache it and gain back speed
* The Messenger: hardcode the prereqs for more speed
* make the linter and mypy happier
* use cached_property
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