* Rogue Legacy: More refactoring and clean up.
* Also marked Blacksmith as Progression as it's used in a rule.
* Remove extra newline.
* Prevent divide by zero type error.
* Scratch last commit, got the math mixed in my head.
* Clarified name of rule regarding percentage of stat upgrades.
* Move early vendors/architect creation into `create_items` logic.
* Rename parameter in `create_region`.
* Rename local var in `create_region`.
* Removed accidental links in Markdown docs.
* Refactor `create_region` signature and caller.
* Remove redundant if-else.
* Revert change to if-else, and moved item_pool to function instead of obj var.
* Rename LegacyLogic to RLLogic.
* Remove LogicMixin for rules.
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