Features

Adds a new configuration flag hyphen=False, which will replace underscores _ with hyphens -. Can be used in conjunction with snake_case=True (camelCase -> snake_case conversion will be performed prior to converting underscores to hyphens).
Adds a new configuration parameter transform, where a user can provide their own string-to-string transformation function for modifying registry keys.
Renamed registry.py to _registry.py to prevent users from accidentally from autoregistry import registry (instead of importing Registry).

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