dblock / ruby-enum / #18

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Pull #58

Fix NoMethodError when a subclass defines no enums of its own

Ruby::Enum's class methods (keys, values, key?, value?, key, value,
to_h, parse, each) relied directly on @_enum_hash/@_enums_by_value
instance variables, which are only set the first time define is
called. A subclass that includes Ruby::Enum only through inheritance
and never calls define itself never gets these ivars set, so calling
any of the above methods raised NoMethodError on nil.

Introduces private _enum_hash/_enums_by_value reader methods that
default to an empty hash, and uses them everywhere instead of the raw
instance variables.

Closes #49.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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