Deep-copy the data contained by both the ConfigStruct and
ConfigProto classes. This prevents modification of the original
proto data when creating a struct out of a reference
Both clone methods are nearly identical. Tried to implement clone
in the common parent ConfigStructLike but did not work.
ConfigStructandConfigProtoclasses. This prevents modification of the original proto data when creating a struct out of a referenceclonemethods are nearly identical. Tried to implementclonein the common parentConfigStructLikebut did not work.Fixes #55