An instance of this class permits to manage {Enum}s. In fact, Enums is a collection of {Enum}s.
@return [nil]
@param [Enum] enum Add an {Enum} to the collection.
@param symbol a symbol to find in merge symbol maps of all enums. @return a symbol
@param query enum tag or part of an enum name @return [Enum] Find a {Enum} in collection.
[Validate]